麻烦详细解释一下下面这个句子这样写的好处:They support the cables from which the bridge has been suspended(新概念3 ,lesson 17)they指代的是towers

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麻烦详细解释一下下面这个句子这样写的好处:
They support the cables from which the bridge has been suspended(新概念3 ,lesson 17)
they指代的是towers

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该句是定语从句,好处在于该句用“介 which(物)/whom(人)”的形式.原句为They support the cables “where” the bridge has been suspended from.用from which=where在语法上较为高级.