It is exhilarating, but it is nearly impossible to explain to outsiders how the pieces fit together, which they often don't in any coherent way. 请老师分析一下这个句子,which 指代什么?
It is exhilarating, but it is nearly impossible to explain to outsiders how the pieces fit together, which they often don't in any coherent way. 这是 which 的一种特殊用法,它可以指代主句中的部分成分,如名词、代词、形容词(词组)、不定式或其他成分。这里,which 指代 fit together(整合在一起),they 仍然指 the pieces。如果把 which 去掉,从句就是一个完整的句子:they often don't fit together in any coherent way.