50分急求一封英文邀请函，在线等。

Dear Porfessor XXX of XXX history dearpartment, XXX University

How do you do.
I am the head of the the student union of XXX department in XXX university. We are thinking to arrange a lecture of chinese history for our fellow students. Considerting the reputation, influence and contributions you made over the last few decades to china's history. We all agree without doubt that you are one of the most reputable and prestigious scholars in the chinese history.We will all feel honored having you to lecture us the chinese history, if that is possible.
Our student union planed to hold this lecture on 1st of February in the center of conference building in XXX university.
Representing all the sutdents of our XXX deparment,I will be much obliged to have your reply to let us know if you are available at that time we fixed.

Sincerely

XXX, head of student union
XXX department of XXX University

中文的时间地点人物呢

An Invi