十五的英语单词怎么写：fifteen。

例：三个五等于十五。Three fives are fifteen.

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例句：

I hadn't seen her for fifteen years and then there she was, (as) large as life.

我有十五年未见过她，却在那里遇见她了，没错，就是她。

He started beating me when I was about fifteen but I didn't do anything to provoke him.

那时候大多数人上学只上到十五岁。

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

男生有十五位，女生有十九位。