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
We think of relativity's effects on time as occurring at near lightspeeds or in the presence of crushing gravitational fields.
我们一般认为只有在接近光的速度或存在着支离破碎的引力场的情况下，才要考虑相对论对时间的影响。
2
These particles of light are the fastest things in the universe, so an optical computer could theoretically process information at speeds that make even a supercomputer look glacial.
光粒子是宇宙中速度最快的东西，所以一台光学计算机在理论上可以在计算机启动前就能处理完信息。
3
At some point they will be travelling so fast that the way they bond will be affected by Albert Einstein's theory of relativity, which departs from classical theories at speeds close to that of light.