| 单词 | 光度 |
| 释义 | 〔photon〕A unit of retinal illumination, equal to the amount of light that reaches the retina through 1 square millimeter of pupil area from a surface having a brightness of 1 candela per square meter.光度：视网膜亮度单位，相当于每平方米有一烛光亮度的表面，通过一平方毫米的瞳孔区域，到达视网膜的光线数量〔brightness〕The effect or sensation by means of which an observer is able to distinguish differences in luminance.敏锐：观察者赖以能够分辨不同光度的效应或感觉〔maximum〕The magnitude of the star at such a moment.变星极亮时的光度〔Polaris〕A star of the second magnitude, at the end of the handle of the Little Dipper and almost at the north celestial pole. Also called North Star ,polar star ,polestar 北极星：第二星的光度中的一颗星，位于小熊星座把柄的末端，几乎位于北天极 也作 North Star,polar star,polestar |
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