thirty /ˈθə:ti/ I. num. 三十；三十岁: He is thirty. 他三十岁了。‖II. n.( pl.) 1. 三十来岁：She died in her thirties. 她三十多岁就死了。2. (the thirties) （温度）三十来度；三十年代：The temperature is expected to be in the thirties tomorrow.明天气温三十多度。My family fled Germany in the thirties.我全家三十年代去了德国。
thirtieth num. 第三十；三十分之一：her thirtieth birthday她三十岁生日；the thirtieth of November11月30日；seven thirtieths of a degree 三十分之七度
