Noun:

1. distance measured in terms of the speed of light (or radio waves);

   "the light time from Jupiter to the sun is approximately 43 minutes"
   

Lightnern.莱特纳lightn.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light-tight box暗箱light-absorbing吸收光,吸收光线的light floral odor淡花香light valve array光阀阵列Light Area Weapon轻型区域防御武器light distributor光分布器lightwave network光波网light bromination光溴化light distillates[化] 轻馏分油Light Patrol Boat轻型巡逻艇