on which 与in which 的区别：中文含义不同、用法不同。on which中文翻译为“在……的上面”，是指具体时间的某一天；in which中文翻译为“在……里面”，可用来引导定语从句，修饰先行词。
一、on which的含义及用法
on which意为在……的上面，具体指某一天，是指具体时间。
例句：There was no strong organizational base on which to build.
缺乏一个坚实的组织基础。
He sat behind a table on which were half a dozen files.
他坐在一张放有6个文件夹的桌子后面。
The vast area not far away is the fields on which they used to graze.
不远处那片广阔的田地就是他们曾经放牧的地方。
Agriculture and industry are the base on which to build up the nation.
工农业乃立国之本。
He has calculated the day of the week on which Christmas will fall.
他推算出圣诞节该是星期几。
The answer depends on which component happens to be stronger.
答案取决于哪种要素的影响力更强。
Many cars run on petrol which contains lead.
很多车使用含铅汽油。
二、In which的含义及用法
In which意为在其中，在……里面。
例句：There was one respect, however, in which they differed.
然而，他们在一点上有分歧。
We need to create a climate in which business can prosper.
我们需要创造一个有利于生意兴隆的环境气氛。
He had a vision of a world in which there would be no wars.
他幻想有一个没有战争的世界。
This delay gives the party a breathing space in which to sort out its policies.
这一延误使该党有了喘息之机来厘定其政策。
There is a sense in which we are all to blame for the tragedy.
在某种意义上，对这个悲剧我们大家都有责任。
