求教这个句子的解析Soil liquefaction is the process by which the strength or stiffness of soil is weakened by an event like the shaking of an earthquake.为什么是process by而不是process ,这个by在这里是做什么用的?the strength

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求教这个句子的解析Soil liquefaction is the process by which the strength or stiffness of soil is weakened by an event like the shaking of an earthquake.为什么是process by而不是process ,这个by在这里是做什么用的?the strength
求教这个句子的解析
Soil liquefaction is the process by which the strength or stiffness of soil is weakened by an event like the shaking of an earthquake.
为什么是process by而不是process ,这个by在这里是做什么用的?
the strength or stiffness of soil is weakened by an event like the shaking of an earthquake.应该都是which重句的内容吧?

求教这个句子的解析Soil liquefaction is the process by which the strength or stiffness of soil is weakened by an event like the shaking of an earthquake.为什么是process by而不是process ,这个by在这里是做什么用的?the strength
by which 意思是by the process通过这个过程,引导状语从句.去掉by,后面从句the strength or stiffness of soil is weakened by an event主谓宾都有,最多做同位语从句,那就用that引导,单独的which肯定不行的

通过这个程序 取得这个效果
而不是这个程序就是这个效果