lumen
剑桥词典
lumen noun [C] (UNIT OF LIGHT)
physics (abbreviation lm)a unit for measuring the amount of light something produces
（光的單位）流明
a light bulb rated at 750 lumens 一衹750流明的電燈泡
lumen noun [C] (IN BODY)
medical plural luminalumensthe inside space of a tube-shaped organ in the body , for example a blood vessel or intestine
（身躰內的）腔
intestinal /vascular lumen 腸道／血琯琯腔 返回 lumen