【答案解析】July 20,2015
Dear Mr. Chapman
On behalf of the Board of Dalian Daxin Chemicals Corporation, I am extending to you our formal invitation to visit our corporation on its tenth anniversary to be celebrated from August 1 to 3.
At the same time we plan to arrange a meeting between you and the general manager of DDCC, for a talk about our cooperation in the coming year.
We hope you will accept our invitation and look forward to seeing you in China．
Yours sincerely，
(Signature)
[解析]
邀请信是书信的一种，写作时要注意礼貌用语，同时还要用上一些发出邀请的短语或句型：
Could/Can you come to...?
We would be greatly happy if you could come。
We hope you will accept our invitation．
注意书信的格式，一定要写清称呼、结束语和签名，还有正文右上角的时间。