Always end by thanking the professor for his or her time, closing with "Best wishes" or "Regards" (or some other relatively formal, but friendly closing).

通常，在结尾加上“Best wishes”或“Regards”感谢教授付出的精力。(或是别的相关的格式，但是要友好收尾)。

youdao

Sir Alex Ferguson has spoken of the difficulties involved in finding a replacement for a player he regards as one of the best he has worked with.

弗格森爵士说要找个人顶替斯科尔斯这样世界上最好的的球员是很难的。

youdao

Thanks for all and waiting your reply we will send you our best regards.

感谢您所作的一切，等待您的答复，送上我最美好的祝福。

youdao

With best regards and heartfelt thanks for your love of our country and your help in securing it.

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