below the topsoil of the earth is the subsoil,a layer that contains stones mixed withorganicmatter为什么layer前用a,这个是同位语从句,还是定语从句?是不是这种从句that前面的名词就是泛指不是特指?
问题描述：
below the topsoil of the earth is the subsoil,a layer that contains stones mixed withorganic
matter
为什么layer前用a,这个是同位语从句,还是定语从句?是不是这种从句that前面的名词就是泛指不是特指?
答
layer,岩层,是可数的,所以前面用a layer 表示一级岩层.a layer 跟 the subsoil是同位语关系,that contains stones mixed withorganic matter整句话是that引导的定语从句修饰a layer.that是定语从句的关系代词,在从句...