开门见山,闲话少叙.
定语从句中,只有当定语从句的先行词为地点（或抽象地点）时,关系副词where才能与介词（in/on/at）+ which互换使用.如：
This is the factory where/in which I worked for two years.
It's helpful to put children in a situation where/in which they can see themselves differently.
而当定语从句的先行词不是地点,而是其它情况时,可以使用介词（in/on/at）+ which时,则不能换为关系副词where.如：
I don't like the way in which you speak to others.