基数词1one2two3three4four5five6six7seven8eight9nine10ten11eleven12twelve13thirteen14fourteen15fifteen16sixteen17seventeen18eighteen19nineteen20twenty21twenty-one22twenty-two23twenty-three24twenty-four25twenty-five26twenty-six27twenty-seven28twenty-eight29twenty-nine30thirty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