Light is the fast thing in the world,the speed of which is 300.000 kilometers per second.

题目

Light is the fast thing in the world,the speed of which is 300.000 kilometers per second.
Light is the fast thing in the world,whose speed（the speed of which）is 300.000 kilometers per second.
为什么不是the speed of whose
就像a friend of mine 不是对应上面的whose吗?那为什么不一样呢?

答案

which 是 指代 前面的 Light 把.

其实 the speed of which 多余了. 完全可以 只用 the speed 就可以了,应为默认指的光速了.

或者直接用 which 从句 就可以了.