(Physics)the SI unit of luminous flux, equal to the amount of light emitted per second in a unit solid angle of one steradian from a uniform source of one candela (物理)流明
语源
late 19th cent.: from Latin, literally light'
lumen2 [ˈluːmən] (pl. lumina -mɪnə)
(Anatomy)the central cavity of a tubular or other hollow structure in an organism or cell (剖)腔