名词
中文翻译：下降的亮度
同义词：
['declining brightness', 'decreasing luminosity']
例句：
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1. Thesun's rays are gradually diminishing as the day wears on.
随着时间的流逝，太阳的光线逐渐减弱。
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2.The room was dimly lit, with only a few candles casting a descending luminance.
房间昏暗，只有几支蜡烛在发出微弱的光亮。
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3.As the night fell, the stars began to twinkle more brilliantly, creating a descending luminance in the sky.
随着夜幕降临，星星开始闪烁得更加明亮，天空中形成了一道道上升的光芒。