30的英语单词怎么写

　　例句：

　　Only thirty students graduated in Chinese last year.

　　去年只有三十名学生获得汉语学士学位。

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

　　他三十岁时已拿到4万英镑的年薪了。

　　We are expecting thirty or so people to come.

　　我们预计要来三十人左右。