Introduces concepts of speed, light speed, faster-than-light speed.
介绍了速度、光速、超光速的概念。
Light travels faster than sound at the speed of 300,000 kilometres per second.
光速比声速要快，为每秒钟30万公里。
Our teacher told us that the speed of light is faster than that of sound.
我们的老师昨天告诉我们，光速是比声速快的。
I thought nothing is faster than speed of light.
我想没有比光速更快的。
I thought nothing is faster than speed of light.
我想没有比光速更快的。
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