英式：[ˈfɪftiːfˈɔːθ]
美式：[ˈfɪftiːfˈɔːθ]
num.第五十四
Time is sometimes called the fourth dimension. 时间有时被称为第四度空间。
Although he's nearly fifty, he can still play tennis with the best. 尽管他已年近五十，可是他网球还是打得不比别人差。
He does not look fifty by any manner of means. 他看上去一点不像50岁的人。
There are more than fifty workers in this workshop. 这个车间里有五十多个工人。
Some fifty shares lie on his hands. 他还有50来股没脱手。
Fifty years has passed away since they met. 自从他们见面，50年过去了。
