| 单词 | 光通量 |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔luminous efficiency〕The ratio of the total luminous flux to the total radiant flux of an emitting source.发光系数：任何光源所辐射的总光通量与该光源总辐射通量之比美国传统〔luminous flux〕The rate of flow of light per unit of time, especially the flux of visible light expressed in lumens.光通量：单位时间内光通量的比例，尤其是以流明表示的可见光的通量美国传统〔luminous intensity〕The luminous flux density per solid angle as measured in a given direction relative to the emitting source.发光强度：在光源的某一给定方向上测量的固定单位角度上光通量密度美国传统 |
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