lumens的翻译，读音
释义：
腔, 流明(光通量单位)
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
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