这两种都是英语的表达方式.用连字符号的时候,后面的单词是单数形式,one-fifith two-fifth
当没有连字符号的时候,后面的单词在遇见多份的时候,是需要复数形式加s的,one third,two thirds
英语分数表达问题Only one-fifth of air consists of oxygen．氧气只占空气的1／5.
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