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求教这个句子的解析Soil liquefaction is the process by which the stren

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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 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 stren
y 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
再问: 搞了半天我还以为这是个定语从句,我认为the strength or stiffness of soil is weakened by an event like the shaking of an earthquake. 都是修饰the process 。 能麻烦你仔细讲讲这个状语从句吗?帮我分析一下他的结构, 谢谢!
再答: 状语从句的主句是the strength or stiffness of soil is weakened固体的硬度和强度被削弱,后面接状语by an event like the shaking of an earthquake通过一种类似于地震的活动。 整个句子讲专业一点就是分子间的剧烈运动导致固体的熔化,只不过为了通俗易懂才写成这样