The speed of a photon is the speed of light.

光子的速度就是光速。

A photon travels at the speed of light.

光子以光速传播。

The speed of light in a vacuum is a constant.

真空中的光速是一个恒定的。

The speed of light is about 300,000 kilometers per second.

光速是大约30万公里每秒。

The speed of light is approximately 300,000 kilometers per second.

光速大约是每秒30万公里。

The speed at which light travels in a vacuum is called the speed of light.

光在真空中的传播速度被称为光速。

The speed of light is the fastest speed in the universe.

光速是宇宙中最快的速度。

The speed of light in a vacuum is an invariant in physics.

真空中的光速在物理学中是一个不变的量。

The collider can accelerate particles to near the speed of light.

对撞机可以将粒子加速到接近光速。

The supercollider can accelerate particles to near the speed of light.

超级对撞机可以将粒子加速到接近光速。