英文:The act or an instance of gradually diminishing in brightness, loudness, or strength until actual disappearance occurs.
中文: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
英文: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.
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