in which可以翻译成在„„里面 for which可以翻译成为了„„目的 on which可以翻译成在„„的上面,或具体时间的某一天 at which可以翻译成在„„里面或在„„上面 这些介词的使用除了意思上的区别,具体是要以which引导的从句而定的.例如：(1) The school (that/which) he once studied in is very famous.= The school in which he once studied is very famous.(2) Tomorrow I will bring here a magazine (that/which) you asked for.= Tomorrow I will bring here a magazine for which you asked.(3) I have a dresser in my bedroom,which there are many cosmetics on.= I have a dresser in my bedroom on which there are many cosmetics.(4)The dumpling House which he often has dumplings at is very popular.= The dumpling House is very popular,at which he often has dumplings.
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