名词
中文翻译：光速
同义词：
['speed of light', 'speed of propagation']
例句：
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1. Thespeed of light is constant regardless of thedistance between the source and the observer.
光速在源和观察者之间的距离不变时是恒定的。
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2. The speedof light is used tocalculate the time it takes forlight to travel a certain distance.
光速被用来计算光在一定距离内旅行所需的时间。
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3. The speed of light is oneof the fundamental constants in physics.
光速是物理学中的一个基本常数。