normal brightness 正常亮度 ; 正射亮度
When one is firing, its brightness can exceed a thousand normal galaxies.
当一个类星体爆发时,它的亮度可以超越一千个常规的星系。
It is normal for white gold jewellery to lose brightness over time, but white gold wedding rings can be maintained with rhodium plating every few years or so.
白金珠宝随着时间的流逝失去光泽是很正常的事情,但是你可以通过每隔几年将其重新镀铑来使其保持光泽。
But after the X-ray pulse passes through, the cloud fades to its normal brightness.
但当X射线脉冲通过后星云就暗淡下来回到通常的亮度。
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