1. Stars vary in brightness. 
   星星光亮度不同。
2. Three factors are responsible for the so-called magnitude of a star, -- that is, for its brightness as seen from the earth, namely, its distance from the earth, its temperature and its size. 
   一个星球的所谓“等级”，即从地球上看到的它们的亮度，取决于三个因素，即它和地球之间的距离，它的温度和大小。
3. devoid of brightness or appeal. 
   缺乏明亮或者吸引力。
4. lacking brightness or color; dull. 
   缺乏鲜亮或者颜色；暗淡的。
5. Brilliance or radiance of light; brightness. 
   光辉，光彩；光亮

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