假如你是黄海大学历史系的二年级学生李明，请写信给你校的 Smith 教授， 代表学生会邀请他于五月份某周六给同学们做一场关于欧洲历史的讲座。具体题目请 Smith 教授自定，讲座时间约一个半小时，之后安排半小时的问答环节。
History Department
Huanghai University
March 28, 2015
Dear Professor Smith，
I’m Li Ming a second-year student in the History Department. It is my pleasure to write, on behalf of the Student Union, to warmly invite you to give us a lecture on European history.
The lecture is to be held on a Saturday in May. You can decide on the specific topic of the lecture, since we are interested in any aspect of the European history. The lecture is expected to last about 1.5 hours, followed by a 30-minute question-and-answer session.
Thank you for your time We are eagerly looking forward to your early reply.
Sincerely yours,
Li Ming