People write yours, yours sincerely, sincerely yours, or yours truly at the end of a letter before they sign their name.
With best regards, Yours, George.
谨致问候。你真诚的:乔治。
A speaker or writer uses yours to refer to something that belongs or relates to the person or people that they are talking or writing to.
I'll take my coat upstairs. Shall I take yours, Roberta?
我要把我的外套拿到楼上去。要我把你的拿上去吗,罗伯塔?
I believe Paul was a friend of yours.
我想保罗曾是你的朋友。