40一50的英文怎么写

例句：

Fifty is the new forty。

四十尚未老，五十正当年。

You can't live on forty pounds a week。

你靠每周四十英镑没法过活。

He told us that her age was forty—eight or thereabouts。

他告诉我们她的年龄在四十八岁左右。

They would have been married forty years come this June。

到今年六月他们结婚就有四十年了。