30的单词怎么写

　　By this time he was thirty.

　　到那时他30岁了。

　　I was a virgin until I was thirty years old.

　　我30岁前一直是个处女。

　　I know that you've been studying chimpanzees for thirty years now.

　　我知道你研究黑猩猩至今已有30年了。

　　The driver was a trim young woman of perhaps thirty.

　　司机是个大约30岁的身材苗条的年轻女子。