second、third、fourth、eleventh、twelveth、thirteenth、fourteenth
除了一到三特殊外,别的都是加-th
比如二十一:twenty-first
one,two,three,four,five,six,seven,eight,nine,ten,eleven,twelve,thirteen,fourteen,fifteen,sixteen,seventeen,eighteen,nineteen,
二十一是twenty-one,三十八是thirty-eight
依此类推.