You can't travel faster than the speed light.

你不可能比光速还快。

This is the number we think of as the speed of light, c, but, more accurately, this is just the speed light travels in a vacuum.

这是我们认为的光速，c，但是，更准确地说，这只是光在真空中传播的速度。

First, its speed: light from anything moving away from you becomes redder in color (kinda like how police sirens get lower in pitch when moving away).

首先，是它的速度：任何远离你的物体发出的光会变得更红（有点像警笛在移动时音调变低）。

Along the narrow walls of this passageway, I saw only brilliant streaks, hard lines, fiery furrows, all scrawled by our speeding electric light. With my hand I tried to curb the pounding of my heart.

地道两边狭窄的高墙上，我只看见飞奔的速度在电光下所画出的辉煌线纹、笔直线条、火色痕迹。我的心跳动不止，我用手压住心头。

Now, if you think about it, technically, whatever speed light is going is the speed of light, but when that light passes through something like water, glass, or even air, it's not the fastest possible thing anymore.

如果你仔细想想，从技术上讲，无论光的速度是多少，都是光速，但是当光穿过水、玻璃，甚至空气时，它不再是最快的了。