Dear, I thought I'd drop a line.
亲爱的，想起来要给你写封信。
You are welcome. Have a nice trip. Please drop a line after you get there.
不客气。旅途愉快。到那儿后记得给我写信。
I must drop a line to my mother.
我必须给我母亲写封信。
I must drop a line to my uncle to thank him for having us.
我得写封信给舅舅，感谢他邀请了我们。
I must drop a line to my uncle to thank him for having us.
我得写封信给舅舅，感谢他邀请了我们。
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