thirty 英[ˈθɜ:ti] 美[ˈθɜ:rti] n. 三十; 三十个; 三十年代; 三十的记号; adj. 三十的，三十个的; num. 三十; 三十个; [例句]Mozart clearly enjoyed good health throughout his twenties and early thirties. 显然，莫扎特在二十几岁到三十刚出头时，身体非常好。

[其他] 复数：thirties。