1、30的英文翻譯是thirty,音標:英 [ˈθɜ:ti],美[ˈθɜ:rti],n. 三十;adj. 三十的,三十個的;num. 三十,三十個。
2、[例句]There were at most thirty people in the room.屋裏頂天兒三十個人。