beam velocity

例句：

1. 1. The beam velocity of light is the speed at which light travels through space.
   光速是光在空间中传播的速度。
2. 2.The beam velocity of lasers is much faster than that of traditional light sources.
   激光的光束速度比传统光源快得多。
3. 3.The beam velocity of a particle accelerator determines the accuracy of its measurements.
   粒子加速器的光束速度决定了其测量的准确性。