lumen
n. 流明,内腔

词形变化:

名词复数:lumens 形容词:lumenal

英英解释:

名词 lumen:

  1. a unit of luminous flux equal to the amount of light given out through a solid angle of 1 steradian by a point source of 1 candela intensity radiating uniformly in all directions
  2. 同义词:lm
  3. a cavity or passage in a tubular organ