30的英語單詞怎么寫

　　例句：

　　Only thirty students graduated in Chinese last year.

　　去年只有三十名學生獲得漢語學士學位。

　　At thirty years old, he was already earning  40 000 a year.

　　他三十歲時已拿到4萬英鎊的年薪了。

　　We are expecting thirty or so people to come.

　　我們預計要來三十人左右。