例句：
1、 I can give you five tens for that fifty if you want.
你愿意的話，我可以給你5張10美元來換那張50美元。
2、She was born in the fifties.
她是五十年代出生的。
3、 He retired in his fifties.
他在五十多歲時退休了。
4、I probably look as if I'm in my fifties rather than my seventies.
我大概看上去像50多歲而不是70多歲。
5、He began performing in the early fifties.
他20世紀50年代初開始從事表演。