one,two,three,four,five,six,seven,eight,nine,ten,eleven, twelve,thirteen,fourteen,fifteen,sixteen,seventeen,eighteen, nineteen,twenty, twenty-one first,second,third,fourth,fifth,sixth,seventh,eighth,ninth, tenth,eleventh,twelfth,thirteenth, fourteenth,fifteenth,sixteenth,seventeenth,eighteenth, nineteenth,twentyth, twenty-first
21号英语怎么说
