SlideShare a Scribd company logo
INTRODUCTION
Letters are the ambassadors of your
organisation. Many people will never meet you, but
they will form an impression based on your
correspondence
A letter has a key-role to play in personal and
business communication
People have a tendency to avoid letter writing
for one of two reasons:
1) they find the task unpleasant or
2) they fear or know they are bad at it.
. The category you can do something to change, is the
second one. Become aware of common mistakes
people make when writing letters and you can improve
your letter writing skills
TYPES OF LETTERS
•INFORMAL LETTER WRITING
–Letters to friends and relatives
•BUSINESS LETTER WRITING
–Used by traders, firms and
companies
•OFFICIAL LETTER WRITING
–Communication of information by
government officials from one dept
to another and also to companies.
What is a Business Letter?
A business letter is a letter written in
formal language, usually used when
writing from one department to another, or
for correspondence between such
organizations and their customers, clients
and other external parties.
PURPOSE OF EFFECTIVE WRITING
• Writing is essential to communicate your
message clearly and professionally.
• To incite action in those who you
supervise, work with and require action
from.
• Lack of confidence in the workforce who
struggle with the basics of writing including
grammar, spelling and punctuation.
• While writing a letter the writer has to
anticipate the reader's questions and
provide answers to those questions.
Examples of Letters in Business
• Enquiries: requesting information, catalogue, prices,
estimates, details, samples, suggesting if something is
possible, methods of payment, asking for discount,
delivery times, etc.
• Replies and Quotes: confirming help, selling products,
referring to someone, suggesting demonstration,
contacting local representatives, quotations, price lists,
discount, alternatives to something, explaining
payment, delivery times, product training programmers,
fix and negotiate terms, estimates.
• Orders: placing order, letter of acceptance confirming
conditions and terms, delivery times, packing, shipping,
accepting or rejecting changes, delivery delays,
refusing a delivery …
Examples of Letters in Business
• Payment: invoices, pro-forms, statements of account,
methods of payment (home or abroad), advice of
payment, of non-payment, further reminders and final
demands
• Complaints: writing complaints, explaining problems,
suggesting acceptable solutions, replies to complaints,
justifiable and unjustifiable complaints, explaining
company's situation, adjusting accounting errors.
• Credit and Banks: form of credit, credit requirements,
asking for credit, accepting or refusing credit, taking up
references, bank facilities, deposit accounts, requesting
cheque books, credit cars, overdraft, outstanding
orders
Writing Effective Letters
• Analyze Your Audience:
– Who is my audience?
– Will my audience be favorably or unfavorably disposed to what I
am going to say?
– What kinds of information will my audience expect me to supply?
– How will my audience use the information I am sending?
– What impression do I want my letter to make on readers?
• Have a clear sense of your purpose and theirs
• Select the best communication strategy
• Draft, revise, and edit your letter
The Main Components of a
Business Letter
• Business letters usually contain the following information (in this
order):
1. Writer's address (street, city, country).
2. Date of writing
3. Recipient's name, job title, and address
4. Subject
5. Salutation or Greeting (Dear Mr./ Mrs./ Ms…..)
6. Message (body of the letter)
7. Closing
8. writer's signature, typed name, and position of sender
9. In some situations, a business letter may also include the
following optional information:
10. Writer's Initials: typist's initials ( if writer did not type letter).
11. Enclosures (Encl:)
12. Carbon copy Recipients (cc:)
13. Photocopy recipients (xc:)
Salutation
• To address a person whose name or sex
you do not know you use Dear Sir or
Madam
• *When you do not know the name of a man
you are writing to, Dear Sir is used.
• *If you are addressing a woman whose
name you do not know, you use Dear
Madam.
• When you are addressing a company, you
begin your letter Dear Sirs
An opening
This says why you are writing. For example
• *We are writing to enquire about...
*We are writing in connection with...
*We are interested in ...and we would like
to know...
If you are answering the letter, you can start:
• *We have received your letter of....
*Thank you for your letter of....
BASIC BODY STYLE:
Plan your letter in advance and keep it simple
1ST
PART of the body: • State the purpose of
the letter
2ND
PART of the body: • Sate your point. explain
what you want to happen. Explain the
information you have. You have a lot of
information? Break it, make short paragraphs,
list the points, or include it as an attachment.
3RD
PART of the body: • Call for action or
request some form of action. what to do and
when to do it
Thank the reader for his or her response
Signing off…..
Here are some ways to end a letter
• *I look forward to receiving your
reply/order/products
*Looking forward to hearing from you
• *I hope that this information will help
*Please contact me/let me know if you
need any further information
• If you know them personally - Yours sincerely
• If you don’t know them - Yours faithfully
• RE-READ YOUR WHOLE LETTER!!!!
Basic Letter Formats
There are three common formats for
the business letter:
1. The unblocked format.
2. The semi-blocked format.
3. The blocked format.
The unblocked format
The first line of the paragraph is
indented a few spaces
The writer's address, the date, the
closing, the writer's signature , and the
typed version of the writer's name and
job title are indented two thirds of the
way across the page.
Letter drafting ppt 15 feb
The semi-blocked format
The first line of the paragraph is lined up
with the left margin
There is an extra blank line between
paragraphs to signal the start of a new
paragraph.
The writer's address, date, closing, and
signature are indented as in the unblocked
format.
Letter drafting ppt 15 feb
The blocked format
The first lines of paragraphs and all the other
address, date, closing and signature
information are lined up with the left margin.
There is an extra blank line between
paragraphs.
Letter drafting ppt 15 feb
The Use of Letterhead
Stationery
• When a writer is representing a company or
organization, he/she should use the
organization's letterhead stationery for
correspondences with people outside the
organization.
• When using letterhead, the location of the
writer's address, city, state will be usually given
in the letterhead typed at the top of the page.
• If a letter requires more than one page, the
additional pages are called continuation pages
are typed on plain paper, not letterhead.
Letter drafting ppt 15 feb
Technical Suggestions on Letters
• Capitalization
– Don’t overdo it (e.g. no need to cap job titles,
seasons of the yr, courses taken, senior, agriculture,
etc.)
• Punctuation
– Don’t overuse commas, semicolons; use periods to
avoid run-on sentences; no need to use period after
two-letter abbreviation of state or street
• Spelling
– No mistakes (use spell check); pay attention to
hyphenated words (e.g. in-depth, two word
adjectives preceding noun).
• Small words better than big words for eg:
– try vs endeavor
– end vs terminate
– begin vs commence
Technical Suggestions on Letters
• Use conversational style
– Example: ‘Enclosed herewith is the above mentioned and
requested information’ vs ‘I am enclosing the information you
requested’
• ACTIVE vs. PASSIVE Instead of:
In early April, all applications will be reviewed by the
committee
Use: The committee will review all applications in early
April
Don’t use multiple fonts or typefaces. In addition to
making sure your chosen font is easy to read, you
should also avoid the use of too many typefaces
Do not use language that is too colloquial like
"Don't worry, I'll get your money back". Something like
" Your loan will be repaid" is much better
INFORMAL VS FORMAL
In the process of going from the informal to
the formal, certain syntactic changes often
take place like:
• - Verbal style tends to become Nominal
• e.g. I received -> I acknowledged receipt.
• - Present tense change:
• e.g. I'm referring -> I refer
• - Personal becomes Impersonal
• e.g. I am reluctant to resort to such measures
• -> we are reluctant to resort to such ,measures.
INFORMAL VS FORMAL
• Active to passive voice transformation:
• e.g. You haven't settle your bill yet
• -> Payment of your bill is still outstanding
• - Contractions are replaced by full forms:
• e.g. I'll have to -> I shall have to
• - Short, simple sentences become longer and more
complex:
• e.g. I refer to your letter of 10th October. In it we asked
you to clear the balance of $ 519.35. This amount has
been outstanding since last July
• -> With reference to your letter of 10th October, we
would like to remind you again to clear the balance of $
519.35, which has been outstanding since last July.
Common grammar errors and
recommendations
IS BECAUSE?
• Mistake: The reason that our stock price fell
is because third quarter earnings were low.
• Correction: The reason that our stock price
fell is that third quarter earnings were low.
GOOD OR WELL?
• Mistake: We are pleased to report that the
mutual funds performed good this fiscal
year.
• Correction: We are pleased to report that the
mutual funds performed well this fiscal year.
Common grammar errors and
recommendations
DISTANCE, MONEY, AND TIME?
• Mistake: Six miles are the distance between the
home office and the satellite office.
• Correction: Six miles is the distance between the
home office and the satellite office.
ITS OR THEIR?
• Mistake: The practice of this management
company is to have each corporate tenant sign
their lease on the third day of the month.
• Correction: The practice of this management
company is to have each corporate tenant sign
its lease on the third day of the month
Common grammar errors and
recommendations
IT'S OR ITS?
• Mistake: Energy Electronics is introducing it's brand new
line of heating units at the convention.
• Correction: Energy Electronics is introducing its brand
new line of heating units at the convention.
WHO OR WHOM?
• Mistake: We will award free parking to the employee
who the personnel director selects.
• Correction: We will award free parking to the employee
whom the personnel director selects.
The Importance of drafting
Letters
• Represent your company’s public image
and your competence
• More personal than a report, yet more
formal than memos or e-mail
• More permanent than e-mail
• Constitute an official legal record of an
agreement
All depends upon how well it is
drafted and presented
Drafting good letters is an art that all
people especially technical should
master.
The style and skills required for formal
writing are best developed by practice
and experience, but with the right tools
and know-how it is not hard to improve.
So, lets make a start right now…..
FINAL QUOTES
Writing letter exercises
• Pretending that you were working for an
advertising company and one of its competitors
invited you to work for them. Writing a letter
accepting/refusing the invitation
• Pretending that your company receives
complaints from your familiar customers, write a
reply to this complaint.
• Pretending that you are applying for a job in
HUFS campus, write an application form for this
situation.
Points to be noted in CLAIM LETTERS:
Purpose: Express a complaint and request specific
action (must have both)
• Choose a direct or indirect approach
– Direct is best for routine claim letters: claim is backed by
guarantee, warrantee, contract, reputation, or more
– Indirect is best for arguable claim letters: when the claim is
debatable or unusual
• Use a professional, rational, if possible positive, tone,
and not a hostile, negative, and/or emotional tone
• Clearly describe product or service with necessary
details
• Explain the problem with details
• Propose a fair, precise, and appropriate
request/adjustment
• Present an explicit deadline
ADJUSTMENT LETTERS:
Purpose: Respond to claim letter with
solution
• Work to reconcile the situation and restore
the customer's trust in your company
• “Be prompt, courteous, and decisive”
• Use a positive or neutral tone without
being begrudging or taking full blame
• Two types: “Yes” or “No”
“YES” ADJUSTMENT LETTERS
• Start with an apology and admit claim is
justified
• Quickly present favorable news
• Specifically state how you are correcting
the problem
• Explain what happened and why
• Conclude with a friendly, positive note
“NO” ADJUSTMENT LETTERS
• Use an indirect approach
• “Thank the customer for writing”
• Restate the customer’s problem
• Explain what happened and why without placing
blame
• Clearly state discussion without hedging
• Link “no” to benefits
• Conclude with concise gracious statement to
(leave) open the door to future business

More Related Content

Letter drafting ppt 15 feb

  • 1. INTRODUCTION Letters are the ambassadors of your organisation. Many people will never meet you, but they will form an impression based on your correspondence A letter has a key-role to play in personal and business communication People have a tendency to avoid letter writing for one of two reasons: 1) they find the task unpleasant or 2) they fear or know they are bad at it. . The category you can do something to change, is the second one. Become aware of common mistakes people make when writing letters and you can improve your letter writing skills
  • 2. TYPES OF LETTERS •INFORMAL LETTER WRITING –Letters to friends and relatives •BUSINESS LETTER WRITING –Used by traders, firms and companies •OFFICIAL LETTER WRITING –Communication of information by government officials from one dept to another and also to companies.
  • 3. What is a Business Letter? A business letter is a letter written in formal language, usually used when writing from one department to another, or for correspondence between such organizations and their customers, clients and other external parties.
  • 4. PURPOSE OF EFFECTIVE WRITING • Writing is essential to communicate your message clearly and professionally. • To incite action in those who you supervise, work with and require action from. • Lack of confidence in the workforce who struggle with the basics of writing including grammar, spelling and punctuation. • While writing a letter the writer has to anticipate the reader's questions and provide answers to those questions.
  • 5. Examples of Letters in Business • Enquiries: requesting information, catalogue, prices, estimates, details, samples, suggesting if something is possible, methods of payment, asking for discount, delivery times, etc. • Replies and Quotes: confirming help, selling products, referring to someone, suggesting demonstration, contacting local representatives, quotations, price lists, discount, alternatives to something, explaining payment, delivery times, product training programmers, fix and negotiate terms, estimates. • Orders: placing order, letter of acceptance confirming conditions and terms, delivery times, packing, shipping, accepting or rejecting changes, delivery delays, refusing a delivery …
  • 6. Examples of Letters in Business • Payment: invoices, pro-forms, statements of account, methods of payment (home or abroad), advice of payment, of non-payment, further reminders and final demands • Complaints: writing complaints, explaining problems, suggesting acceptable solutions, replies to complaints, justifiable and unjustifiable complaints, explaining company's situation, adjusting accounting errors. • Credit and Banks: form of credit, credit requirements, asking for credit, accepting or refusing credit, taking up references, bank facilities, deposit accounts, requesting cheque books, credit cars, overdraft, outstanding orders
  • 7. Writing Effective Letters • Analyze Your Audience: – Who is my audience? – Will my audience be favorably or unfavorably disposed to what I am going to say? – What kinds of information will my audience expect me to supply? – How will my audience use the information I am sending? – What impression do I want my letter to make on readers? • Have a clear sense of your purpose and theirs • Select the best communication strategy • Draft, revise, and edit your letter
  • 8. The Main Components of a Business Letter • Business letters usually contain the following information (in this order): 1. Writer's address (street, city, country). 2. Date of writing 3. Recipient's name, job title, and address 4. Subject 5. Salutation or Greeting (Dear Mr./ Mrs./ Ms…..) 6. Message (body of the letter) 7. Closing 8. writer's signature, typed name, and position of sender 9. In some situations, a business letter may also include the following optional information: 10. Writer's Initials: typist's initials ( if writer did not type letter). 11. Enclosures (Encl:) 12. Carbon copy Recipients (cc:) 13. Photocopy recipients (xc:)
  • 9. Salutation • To address a person whose name or sex you do not know you use Dear Sir or Madam • *When you do not know the name of a man you are writing to, Dear Sir is used. • *If you are addressing a woman whose name you do not know, you use Dear Madam. • When you are addressing a company, you begin your letter Dear Sirs
  • 10. An opening This says why you are writing. For example • *We are writing to enquire about... *We are writing in connection with... *We are interested in ...and we would like to know... If you are answering the letter, you can start: • *We have received your letter of.... *Thank you for your letter of....
  • 11. BASIC BODY STYLE: Plan your letter in advance and keep it simple 1ST PART of the body: • State the purpose of the letter 2ND PART of the body: • Sate your point. explain what you want to happen. Explain the information you have. You have a lot of information? Break it, make short paragraphs, list the points, or include it as an attachment. 3RD PART of the body: • Call for action or request some form of action. what to do and when to do it Thank the reader for his or her response
  • 12. Signing off….. Here are some ways to end a letter • *I look forward to receiving your reply/order/products *Looking forward to hearing from you • *I hope that this information will help *Please contact me/let me know if you need any further information • If you know them personally - Yours sincerely • If you don’t know them - Yours faithfully • RE-READ YOUR WHOLE LETTER!!!!
  • 13. Basic Letter Formats There are three common formats for the business letter: 1. The unblocked format. 2. The semi-blocked format. 3. The blocked format.
  • 14. The unblocked format The first line of the paragraph is indented a few spaces The writer's address, the date, the closing, the writer's signature , and the typed version of the writer's name and job title are indented two thirds of the way across the page.
  • 16. The semi-blocked format The first line of the paragraph is lined up with the left margin There is an extra blank line between paragraphs to signal the start of a new paragraph. The writer's address, date, closing, and signature are indented as in the unblocked format.
  • 18. The blocked format The first lines of paragraphs and all the other address, date, closing and signature information are lined up with the left margin. There is an extra blank line between paragraphs.
  • 20. The Use of Letterhead Stationery • When a writer is representing a company or organization, he/she should use the organization's letterhead stationery for correspondences with people outside the organization. • When using letterhead, the location of the writer's address, city, state will be usually given in the letterhead typed at the top of the page. • If a letter requires more than one page, the additional pages are called continuation pages are typed on plain paper, not letterhead.
  • 22. Technical Suggestions on Letters • Capitalization – Don’t overdo it (e.g. no need to cap job titles, seasons of the yr, courses taken, senior, agriculture, etc.) • Punctuation – Don’t overuse commas, semicolons; use periods to avoid run-on sentences; no need to use period after two-letter abbreviation of state or street • Spelling – No mistakes (use spell check); pay attention to hyphenated words (e.g. in-depth, two word adjectives preceding noun). • Small words better than big words for eg: – try vs endeavor – end vs terminate – begin vs commence
  • 23. Technical Suggestions on Letters • Use conversational style – Example: ‘Enclosed herewith is the above mentioned and requested information’ vs ‘I am enclosing the information you requested’ • ACTIVE vs. PASSIVE Instead of: In early April, all applications will be reviewed by the committee Use: The committee will review all applications in early April Don’t use multiple fonts or typefaces. In addition to making sure your chosen font is easy to read, you should also avoid the use of too many typefaces Do not use language that is too colloquial like "Don't worry, I'll get your money back". Something like " Your loan will be repaid" is much better
  • 24. INFORMAL VS FORMAL In the process of going from the informal to the formal, certain syntactic changes often take place like: • - Verbal style tends to become Nominal • e.g. I received -> I acknowledged receipt. • - Present tense change: • e.g. I'm referring -> I refer • - Personal becomes Impersonal • e.g. I am reluctant to resort to such measures • -> we are reluctant to resort to such ,measures.
  • 25. INFORMAL VS FORMAL • Active to passive voice transformation: • e.g. You haven't settle your bill yet • -> Payment of your bill is still outstanding • - Contractions are replaced by full forms: • e.g. I'll have to -> I shall have to • - Short, simple sentences become longer and more complex: • e.g. I refer to your letter of 10th October. In it we asked you to clear the balance of $ 519.35. This amount has been outstanding since last July • -> With reference to your letter of 10th October, we would like to remind you again to clear the balance of $ 519.35, which has been outstanding since last July.
  • 26. Common grammar errors and recommendations IS BECAUSE? • Mistake: The reason that our stock price fell is because third quarter earnings were low. • Correction: The reason that our stock price fell is that third quarter earnings were low. GOOD OR WELL? • Mistake: We are pleased to report that the mutual funds performed good this fiscal year. • Correction: We are pleased to report that the mutual funds performed well this fiscal year.
  • 27. Common grammar errors and recommendations DISTANCE, MONEY, AND TIME? • Mistake: Six miles are the distance between the home office and the satellite office. • Correction: Six miles is the distance between the home office and the satellite office. ITS OR THEIR? • Mistake: The practice of this management company is to have each corporate tenant sign their lease on the third day of the month. • Correction: The practice of this management company is to have each corporate tenant sign its lease on the third day of the month
  • 28. Common grammar errors and recommendations IT'S OR ITS? • Mistake: Energy Electronics is introducing it's brand new line of heating units at the convention. • Correction: Energy Electronics is introducing its brand new line of heating units at the convention. WHO OR WHOM? • Mistake: We will award free parking to the employee who the personnel director selects. • Correction: We will award free parking to the employee whom the personnel director selects.
  • 29. The Importance of drafting Letters • Represent your company’s public image and your competence • More personal than a report, yet more formal than memos or e-mail • More permanent than e-mail • Constitute an official legal record of an agreement All depends upon how well it is drafted and presented
  • 30. Drafting good letters is an art that all people especially technical should master. The style and skills required for formal writing are best developed by practice and experience, but with the right tools and know-how it is not hard to improve. So, lets make a start right now….. FINAL QUOTES
  • 31. Writing letter exercises • Pretending that you were working for an advertising company and one of its competitors invited you to work for them. Writing a letter accepting/refusing the invitation • Pretending that your company receives complaints from your familiar customers, write a reply to this complaint. • Pretending that you are applying for a job in HUFS campus, write an application form for this situation.
  • 32. Points to be noted in CLAIM LETTERS: Purpose: Express a complaint and request specific action (must have both) • Choose a direct or indirect approach – Direct is best for routine claim letters: claim is backed by guarantee, warrantee, contract, reputation, or more – Indirect is best for arguable claim letters: when the claim is debatable or unusual • Use a professional, rational, if possible positive, tone, and not a hostile, negative, and/or emotional tone • Clearly describe product or service with necessary details • Explain the problem with details • Propose a fair, precise, and appropriate request/adjustment • Present an explicit deadline
  • 33. ADJUSTMENT LETTERS: Purpose: Respond to claim letter with solution • Work to reconcile the situation and restore the customer's trust in your company • “Be prompt, courteous, and decisive” • Use a positive or neutral tone without being begrudging or taking full blame • Two types: “Yes” or “No”
  • 34. “YES” ADJUSTMENT LETTERS • Start with an apology and admit claim is justified • Quickly present favorable news • Specifically state how you are correcting the problem • Explain what happened and why • Conclude with a friendly, positive note
  • 35. “NO” ADJUSTMENT LETTERS • Use an indirect approach • “Thank the customer for writing” • Restate the customer’s problem • Explain what happened and why without placing blame • Clearly state discussion without hedging • Link “no” to benefits • Conclude with concise gracious statement to (leave) open the door to future business
© 2024 SlideShare from Scribd

玻璃钢生产厂家桥北商场亮化美陈户外绿地玻璃钢卡通雕塑工厂烟台玻璃钢雕塑价格表黑龙江创意玻璃钢雕塑博乐气球商场美陈电话玻璃钢骆驼雕塑制造厂家太湖石玻璃钢仿铜雕塑价格汕头玻璃钢果蔬雕塑杭州户外玻璃钢花盆世界级商场美陈青海抽象人物玻璃钢雕塑浙江周年庆典商场美陈批发价濮阳玻璃钢雕塑制作流程河北欧式玻璃钢雕塑供应商户外玻璃钢雕塑设计吉安市玻璃钢雕塑定制四川玻璃钢花盆四川景观玻璃钢雕塑供应商蚌埠景观玻璃钢雕塑制作供应玻璃钢实物雕塑江门玻璃钢卡通雕塑现货商场美陈是真的吗解说主题玻璃钢雕塑供货商百色市玻璃钢雕塑玻璃钢花盆上色用什么颜料江门玻璃钢园林雕塑山东室内商场美陈哪里有乌鲁木齐商场美陈公司天津玻璃钢雕塑定制价格表长乐玻璃钢伟人像雕塑香港通过《维护国家安全条例》两大学生合买彩票中奖一人不认账让美丽中国“从细节出发”19岁小伙救下5人后溺亡 多方发声单亲妈妈陷入热恋 14岁儿子报警汪小菲曝离婚始末遭遇山火的松茸之乡雅江山火三名扑火人员牺牲系谣言何赛飞追着代拍打萧美琴窜访捷克 外交部回应卫健委通报少年有偿捐血浆16次猝死手机成瘾是影响睡眠质量重要因素高校汽车撞人致3死16伤 司机系学生315晚会后胖东来又人满为患了小米汽车超级工厂正式揭幕中国拥有亿元资产的家庭达13.3万户周杰伦一审败诉网易男孩8年未见母亲被告知被遗忘许家印被限制高消费饲养员用铁锨驱打大熊猫被辞退男子被猫抓伤后确诊“猫抓病”特朗普无法缴纳4.54亿美元罚金倪萍分享减重40斤方法联合利华开始重组张家界的山上“长”满了韩国人?张立群任西安交通大学校长杨倩无缘巴黎奥运“重生之我在北大当嫡校长”黑马情侣提车了专访95后高颜值猪保姆考生莫言也上北大硕士复试名单了网友洛杉矶偶遇贾玲专家建议不必谈骨泥色变沉迷短剧的人就像掉进了杀猪盘奥巴马现身唐宁街 黑色着装引猜测七年后宇文玥被薅头发捞上岸事业单位女子向同事水杯投不明物质凯特王妃现身!外出购物视频曝光河南驻马店通报西平中学跳楼事件王树国卸任西安交大校长 师生送别恒大被罚41.75亿到底怎么缴男子被流浪猫绊倒 投喂者赔24万房客欠租失踪 房东直发愁西双版纳热带植物园回应蜉蝣大爆发钱人豪晒法院裁定实锤抄袭外国人感慨凌晨的中国很安全胖东来员工每周单休无小长假白宫:哈马斯三号人物被杀测试车高速逃费 小米:已补缴老人退休金被冒领16年 金额超20万

玻璃钢生产厂家 XML地图 TXT地图 虚拟主机 SEO 网站制作 网站优化