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some types of 后面的名词为什么用单数
some types of 后面的名词为什么用单数Some types of camel have two humps and others have one. 请问,这里的 camel 为什么用单数?它不是可数名词吗?因为 some types of 后面的名词可以用复数吗?谢谢!