2026-04-22 16:24:19 浏览次

lumen是什么意思 英[ˈluːmɪn] 美[ˈluːmɪn] n. 流明, 腔[医] 腔, 流明(光通单位)n. a unit of luminous flux equal to the amount of light given out through a solid angle of 1 steradian by a po...