本句中,关系词所指代的内容在we can know better...从句中充当状语,也即,With experience, we can know better...,因此which前必须添加介词with。其他常见的“介词+关系代词”还有:for which(在从句中作目的或原因状语), in which(在从句中作地点状语), to which(与从...