fifteen同义词转换

fifteen意思是十五，没有同义词，但是可用***数字15表示。

例句：

In those days most people left school when they were only fifteen years old.

那时候，大多数人上学只上到十五岁。

The wiring in your house should be renewed every ten to fifteen years.

你家里的电线应该每十到十五年更新一次。