by weight（英语问题）

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by weight（英语问题）
您好!“按重量计算” 是：by weight .但“按千克计算” 是：by the kilo .
类似的还有：by the yard 等等.请问,这一类的有什么规律吗?请列举.

一般by 后边加的名次是具体的话,比如是按千克或是按天,就是by the kilogram ,by the day ; 不是具体的话比如时间,重量,数量,就是by time ,by weight ,by number !你可以理解的

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