which have brought a lot of harm in our daily life.这句话前面which have不能理解,这什么用法?

问题描述:

which have brought a lot of harm in our daily life.这句话前面which have不能理解,这什么用法?

现在完成时,表示现在已经为我们的日常生活带来了伤害.which引导,可以作为定语从句.