麻烦详细解释一下下面这个句子这样写的好处：
问题描述：
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
答
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.