英文原文：twelve thirteen fifteen eighteen twenty-three英式音标：[twelv] [θɜːˈtiːn; ˈθɜːtiːn] [fɪfˈtiːn; ˈfɪftiːn] [eɪˈtiːn; ˈeɪtiːn] [ˈtwentɪ]-[θriː] 美式音标：[twɛlv] [ˈθɜˈtin] [ˌfɪfˈtin] [ˌeˈtin] [ˈtwɛnti]-[θri]
