逗号后面which引导什么从句

　　His speech was full of fine words which meant nothing.

　　他的演讲华而不实。

　　Which is the best route to take?

　　哪一条是最佳路线？

　　One major difference between these computers concerns the way in which they store information.

　　这些计算机之间的一个主要差异涉及其储存信息的方式。

　　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。