light speed

英 美
  • 光速
  • light n.光;光线;灯;打火机;领悟;浅色;天窗adj.轻的;浅色的;明亮的;轻松的;容易的;清淡的v.点燃;变亮;照亮adv.清楚地;轻便地
  • speed n.速度;迅速v.加速;急行
Noun:
  1. 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