按照题目要求，用英文写出：

55——fifty-five。

类似的基数词还有很多。举例如下：

62——sixty-two。

847——eight hundreds and forty-seven。

9631——nine thousands six hundreds and thirty-one。

12578——twelve thousands five hundreds and seventy-eight。

5354129——five millions three hundreds and fifty-four thousands one hundred and twenty-nine。

英文单词书写是fifty-five，

I guess she is about fifty-five.

He didn't marry until he was fifty.

And our expectations have changed in the last fifty-five years.