The speed of light is widely regarded as the Universe's ultimate velocity limit.
光速被广泛认为是宇宙中速度的极限。
One of them is: the velocity of light is invariable.
其中一个前提是，光的速度不变。
Einstein's theory links energy with mass and velocity of light.
爱因斯坦的理论把能量同质量和光速联系起来。
At the event horizon, the escape velocity is equal to the speed of light.
在活动视界里，逃逸速度等于光速。
At the event horizon, the escape velocity is equal to the speed of light.
在活动视界里，逃逸速度等于光速。
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