为了适应互联网时代的大发展和国际贸易实务的新变化，这一版修改或更换了一些样信，个别的书信被改写成了电子邮件的书写格式，便于读者更直观地掌握和应用。
本书第九版继续沿用了第八版以二维码扫码获取样信中文翻译和练习答案的学习方式，以提高学习效率。在保留了第八版基本架构的基础上，第九版增添了新的一章，其中包含商家对商家和商家对客户两部分的书信。此外，本教材部分章节的注释内容也做了补充和修订，以丰富和完善专业知识，提升英语语言的应用能力。

Chapter One Business Letters
Section One The Structure and Layout of a Business Letter
Section Two Superscription
Section Three Dissimilarities in Letter Writing
Supplement
Exercises
Chapter Two Establishing Business Relations
Specimen Letters
Supplement
Exercises
Chapter Three Enquiries
Specimen Letters
Supplement
Exercises
Chapter Four Offers
Specimen Letters
Supplement
Exercises
Chapter Five Counter?Offers
Specimen Letters
Supplement
Exercises
Chapter Six Conclusion of Business
Specimen Letters
Supplement
Exercises
Chapter Seven Terms of Payment
Specimen Letters
Supplement
Exercises
Chapter Eight Establishment of L/C and Amendment
Specimen Letters
Supplement
Exercises
Chapter Nine Packing，Shipping Marks and Shipment
Specimen Letters
Supplement
Exercises
Chapter Ten Insurance
Specimen Letters
Supplement
Exercises
Chapter Eleven Agency
Specimen Letters
Supplement
Exercises
Chapter Twelve Complaints and Claims
Specimen Letters
Supplement
Exercises
Chapter Thirteen Electric Commerce
Section One Business to Business
Section Two Business to Customer
Supplement
Exercises
Chapter Fourteen Other Situational Letter Writing
Specimen Letters
Supplement
Exercises
参考书目