30的英语：thirty

thirty：
发音：英 [ˈθɜːtɪ]  美 [ˈθɜrti] 
意思：n. 三十，三十个  adj. 三十的，三十个的
例句：
She's well over thirty, but still behaves as a child.
她三十好几岁了，行为举止还很幼稚。

The building was built about thirty years ago. 
这幢楼建于约30年前。

She was driving at thirty. 
她车速30码。