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周一：Monday周二：Tuesday周三：Wednesday周四：Thursday周五：Friday周六：Saturday周日：Sunday一月：January二月：February三月：March四月：April五月：May六月：June七月：July八月：August九月：September十月：October十一月：November十二月：December基数词onetwothreefourfivesixseveneightnineteneleventwelvethirteenfourteenfifteensixteenseventeeneighteennineteentwenty序数词first(1st)第一second(2nd)第二third(3rd)第三fourth(4th)第四fifth(5th)第五sixth(6th)第六seventh(7th)第七eighth(8th)第八ninth(9th)第九tenth(10th)第十eleventh(11th)第十一twelfth(12th)第十二thirteenth(13th)第十三fourteenth(14th)第十四fifteenth(15th)第十五sixteenth(16th)第十六seventeenth(17th)第十七eighteenth(18th)第十八nineteenth(19th)第十九twentieth(20th)第二十