复数： fifteenths

The fifteenth , accumulate working experience in college .

第十五，大学期间要积累工作经验。

Let us return to paris and to the fifteenth century .

言归正传，还是再回到巴黎和十五世纪这上面来吧。

How many fifteenth century milanese artists can you name ?

有多少15世纪的米兰艺术家你能叫出他们的名字？

Mary just had her fifteenth birthday .

刚过了她十五岁的生日.

So each piece will be one fifteenth .

这样每片是十五分之一。