fifty： 五十个人;五十岁;五十年代;编号为五十的东西五十;五十个

英式音标：[fft]

美式音标：[ffti]

Fifty pounds is the best I can offer you.

我顶多出五十英镑。

I'd say he was about fifty.

我猜他五十岁上下。

Roughly speaking, we receive about fifty letters a week on the subject.

关于这个问题，粗略地说，我们每周能收到大约五十封来信。