21用英语怎么表达?

21英语是：twenty-one；

twenty-one：n.二十一，二十一个所成之一组。

He was stricken at twenty-one with a crippling malady.

他21岁时突患致残重疾。

I was twenty-two — no, twenty-one.

我当时22岁，哎呀不对，是21岁。

He said he was twenty-one years old and the employment agency took him on faith.

他说他21岁，职业介绍所毫不怀疑就相信了他。

Twenty-one years have passed since then.

尔来二十有一年矣。

There are fifteen books on the first shelf, twenty-one on the second, that makes thirty-six in all.

书架的第一层有15本书，第二层有21本，总共是36本。

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