fifty
num.五十个人;五十岁;五十年代;编号为五十的东西五十;五十个；
复数： fifties；
例句：
Hes ancient ─ he must be at least fifty!
他老得很了——肯定至少有五十岁！
To look at him you'd never think he was nearly fifty.
看他的外表，谁也想不到他年近五十了。
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。
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