noun 下载 🔗分享 烛光，坎德拉 In the International System of Units, the base unit of luminous intensity; the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 540 × 1012 hertz and that has a radiant intensity in that direction of 1/683 watt per steradian. Symbol: cd Examples : "The small emergency flashlight had a luminous intensity of only 0.5 candelas, barely enough to see in the dark. " 这个小型应急手电筒的光强只有0.5烛光（坎德拉），在黑暗中几乎看不清东西。 physics unit 与AI对话词汇游戏阅读练习
