Country life gives him peace and quiet,which is he can't enj

1、why为什么?主要用于疑问句中.
2、which指代前面的Country life gives him peace and quiet：农村生活,带给他和平与宁静
3、这里是which引导的定语从句.
which is ( what ) he can't enjoy while living in big cities.
填what做enjoy的宾语,指代他无法享受到的内容.
4、翻译：农村生活,带给他和平与宁静,这是他在大城市中无法享受到的感觉.