名词
中文翻译：Unknown
同义词：
['brightness', 'illumination', 'luminosity']
例句：
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1. Thenew LED light bulb is more efficient andhas a higher luminousness thanthe old one.
这款新型LED灯泡效率更高，发光度也比旧的要高。
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2. The sun's luminousness is measured in lumens, which is a unit of brightness.
太阳的发光度是以流明为单位，这是亮度的一个单位。
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3. Thescientist used a special camerato capture the star'sluminousness during its transitacross the sky.
科学家使用一种特殊的相机捕捉了这颗星星在穿越天空时发出的光亮。