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 new LED bulb has a luminous intensity of 800 candela, making it very bright for reading. " 这款新型LED灯泡的发光强度高达800坎德拉,非常适合阅读,亮度很高。 physics energy unit 与AI对话词汇游戏阅读练习