The act or an instance of gradually diminishing in brightness, loudness, or strength until actual disappearance occurs.
逐渐消失在亮度、响度或精力上逐渐减弱直至全部消失的活动或例子
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
Stars vary in brightness.
星星光亮度不同。
