principle of constancy of light velocity

例句：

1. 1. The principle of constancy of lightvelocity is fundamental to understanding the behavior oflight in space.
   光速恒定原理是理解光在空间行为的基础。
2. 2. This principlehas been used to explain the behavior ofstars and planets in our galaxy.
   这一原理已被用来解释我们银河系中恒星和行星的行为。
3. 3. In physics, the principle of constancy of lightvelocity plays a crucial role in determining thespeed of light in different mediums.
   在物理学中，光速恒定原理在确定不同介质中光速的速度方面起着至关重要的作用。