1、30的英语：thirty，发音: 英 [ˈθɜːti] 美 [ˈθɜːrti]

2、n. 三十年代，num. 三十，adj. 三十个的，[ 复数 thirties ]；短语：Eleven Thirty .

3、 Mozart clearly enjoyed good health throughout his twenties and early thirties.莫扎特显然在二十几岁和三十刚出头时身体很好。