我的一个叔叔是侦探。

One of my uncles is a detective.

住在附近的一个叔叔能照看他们。

An uncle who lives close can watch over them.

我只有一个叔叔。

I've only got one uncle.

他有一个叔叔(舅舅)在一家罐头厂上班.

He had an uncle that worked in a canning factory.

史密斯太太：我听说你有一个叔叔，是吗？

Mrs. Smith: I heard you have an uncle, don't you?