Light travels faster than sound-it's common sense. ;

光速比声速快--这是基本的常识。

The teacher told us light travels faster than sound.

老师告诉我们光的速度比声音快。

Since light travels faster than sound, we see lightening before we hear the peal of thunder.

因为光速大于音速, 所以我们是先看到闪电后再听到雷响.