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By mEAns oF 用法

1.by (1)表示方法,手段.即“用.,通过.”相当于by means of 如: All work had to be done by hand 所有的工作都是手工进行的. He makes a living by teaching 他以教书为生. (2)表示传达、传递的方式或煤介.如: How did you send the letter...

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