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序数词的构成 (1)一般在基数词后加th eg.four→fourth,thirteen→thirteenth (2)不规则变化 one→first, two→second, three→third, five→fifth,eight→eighth, nine→ninth,twelve——twelfth (3)以y结尾的十位整数，变y为ie再加th twenty→twentieth, forty→fortieth, ninety→ninetieth (4)从二十一后的“几十几”直至“几百几十几”或“几千几百几十几”只将个位的基数词变为序数词。 twenty-first,two hundred and forty-fifth (责任编辑：admin) |