1~20的序数词:first second third fourth fifth sixth seventh eighth ninth tenth eleventh twelfth thirteenth fourteen fifteenth sixteenth seventeenth eighteenth nineteenth twentith
21~29的序数词: twenty-first...(之后所有的都是在twenty-后加上相应数字的序数词)
30的序数词:thirtieth
温馨提示:答案为网友推荐,仅供参考