drop a line是什么意思？外国人到外面旅游，习惯在当地买明信片，然后寄给朋友。这时，他们就习惯用Please do drop me a line!让朋友写信保持联系！
drop a line意思是“写信”。

1.Good- bye and be sure to drop us a line if ever you are in London.
再见了，如果你来伦敦千万给我写封信。

2.Drop me a line when you arrive.
你到达以后给我来一封信。

3.Jody’s friend asked her to drop her a line while she was away on vacation.
裘迪的朋友要裘迪去度假时写信给她。

4.Drop me a line to say when you're coming.
 给我写封短信告诉我你来的时间。