参考词典中speed of light的常规释义：
基本释义
参考例句
- The speed of light is an important constant.
光速是一个重要的常数。
英英解释
- the speed at which light travels in a vacuum; the constancy and universality of the speed of light is recognized by defining it to be exactly 299,792,458 meters per second
[同]
c, light speed, speed of light
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