lumen
/'lu:min/
GRE词汇
词频: #25,456中文释义
n. 流明, 腔
[医] 腔, 流明(光通单位)
英文释义
n. 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
n. a cavity or passage in a tubular organ