A brief introduction to the author who answers the dispute about the sales contract.

Wu Rongrong, assistant judge of Shangdi People's Court in Haidian District, Beijing, holds a master's degree in international economic law from Foreign Affairs University. Participate in the preparation of legal books such as Guidelines on Key Difficulties of Company Law, 38 Cases of Companies, and Overall Operation of Creditor's Rights in Property Disputes. Write part of the first chapter, the second chapter, the fourth chapter and the fifth chapter of this book.

Yang Haichao. Assistant Judge of Shangdi People's Court of Haidian District People's Court in Beijing, Master of Economic Law of Central University for Nationalities. He wrote the thesis "On the application of social statistical analysis methods in judicial research" and won the third prize of the 20th symposium of the national court system. Participate in the preparation of legal books such as Guidelines on Key Difficulties of Company Law and 38 Cases of Companies. Write the third, fourth, fifth and sixth chapters of this book.

Cao Mingming, assistant judge of Shangdi People's Court in Haidian District, Beijing, holds a master's degree in civil and commercial law from China Renmin University. Co-authored "Investigation Report on Commercial Invited Mediator System" won the 2007 Beijing Municipal Court System Research Award of Beijing Higher People's Court. Participate in the preparation of legal books such as Guide to Key Difficulties of Company Law, 38 Cases of Companies, Full Operation of Property Dispute Claims, Guide to Evidence of Labor Dispute Litigation, and Full Guide to People's Life Law. Write part of the first, second and sixth chapters of a book.

Wang Yongxin, assistant judge of Beijing Dongcheng District People's Court, master of law of China Renmin University. Participate in the preparation of legal books such as "Guide to Evidence in Labor Dispute Litigation". Write the third chapter of this book.