就是Invitation Letter(邀请函)的格式了!也没有什么特别的,就是较为正式的书信罢了。可参考下面的链接:
http://shwomen.eastday.com/renda/gonggao/node2524/node8716/node8717/node8718/node8719/u1a1368564.html
http://www.spaceweek.org/invitation_letter.html
就是一般信件的开头啦!开门见山即可。
Dear Mr. xx,
Our company once invited you together with your wife Ms. XXX for giving a lecture by discussion with you through the telephone. Now I cannot contact you directly, so I write this letter here to invite you once more for the lecture. Please reply promptly. Thanks.
Yours respectfully
XXX