first ,second ,third ,fourth fifth ,sixth ,seventh ,eighth ,ninth ,tenth,eleventh ,twelfth ,thirteenth ,fourtheenth ,fifteenth,sixteenth,seventeenth,eighteenth,nineteenth,twentieth 序数词是有规律的给你个顺口溜帮助记忆的:基变序,有规律,词尾加上th 一二三,特殊记,词尾字母t,d,d,八减t,九减e,f 来把ve 替(指十二),单词ty 作结尾,ty 变成tie (指二十) 若要碰到几十几,只变末尾就可以。
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