写信的目的不是推销东西，而是让人家回信。
The purpose of an email is not to sell the person on anything other than writing back.
继续写信函的正文内容，以你写信的目的为开头。
Continue with the body of the letter, stating your main purpose for writing.
我写信的目的是想打听一下我遗忘在贵宾馆房间里的一个包的事宜。
I'm writing to inquire about a bag that I left behind in a room at your hotel.
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