on which 與in which 的區別：中文含義不同、用法不同。
on which中文翻譯為“在……的上面”，是指具體時間的某壹天；in which中文翻譯為“在……裏面”，可用來引導定語從句，修飾先行詞。
壹、on which的含義及用法
on which意為在……的上面，具體指某壹天，是指具體時間。
例句：There was no strong organizational base on which to build.
缺乏壹個堅實的組織基礎。
He sat behind a table on which were half a dozen files.
他坐在壹張放有6個文件夾的桌子後面。