1、三十的英语是：thirty，读音：英[ˈθɜːti] / 美 [ˈθɜːrti]。

2、相关短语：Thirty years 三十多年来 ;Thirty Degrees 三十度;Thirty Poems 诗三十首.

3、例句：（1）By this time he was thirty 。到那时他30岁了。（2）I can verify that it takes about thirty seconds. 我能证明，这大约要用30秒的时间。