作业帮21用英文怎么拼
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21用英文怎么拼
21用英文怎么拼
21用英文怎么拼
twenty-one
两位数中间加上小横线
如果是基数词twenty-one;twenty-two;twenty-three;twenty-four
twenty-five;twenty-six;twenty-seven;twenty-eight
twenty-nine
如果是序数词twenty-first;twenty-second;twenty-third;twenty-fourth(不要少了u)
twenty-fifth;twenty-sixth;twenty-seventh;twenty-eighth
twenty-ninth(去e)