1 到 100 的序数词第1first1st 第 2second2nd第 3third3rd 第4fourth4th 第 5fifth5th第 6sixth6th 第7seventh7th 第8eighth8th 第 9ninth9th第 10tenth10th 第 11eleventh11th 第 12twelfth12th 第 13thirteenth13th 第 14fourteenth14th 第 15fifteenth15th 第 16sixteenth16th 第 17seventeenth17th 第 18eighteenth18th 第 19nineteenth19th 第 20twentieth20th 第 21twenty-first21st第 22twenty-second22nd第 23twenty-third23rd第 24twenty-fourth24th第 25twenty-fifth25th第 26twenty-sixth26th第 27twenty-seventh27th第 28twenty-eighth28th第 29twenty-ninth29th第 30thirtieth30th 第 31thirty-first31st 第 32thirty-second 第 33thirty-third 第 34thirty-fourth 第 35thirty-fifth第 36thirty-sixth 第 37thirty-seventh 第 38thirty-eighth 第 39thirty-ninth第 40fortieth 第 41forty-first 第 42forty-second第 43forty-third 第 44forty-fourth 第 45forty-fifth 第 46forty-sixth 第47forty-sev