This process of the establishment of a new form must occur i
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一般来说,which前面有个逗号的是用来修饰句子的,在这里由于中间有个

lying below the threshold of consciousness的状语成分,所以which前面修饰的是前面This process of the establishment of a new form must occur in pattern of nervous activity in the brain的,再看这个句子,是一个以This process 开头加of的句型,可见of 后面的都是修饰the process 的后面的must occur in pattern of nervous activity in the 前面其实是省略了that是个定语成分,所以头句是个以this process 的中心句,后面的which 当时是用来修饰它的拉!

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