But after the X-ray pulse passes through, the cloud fades to its normalbrightness.
但当X射线脉冲通过后星云就暗淡下来回到通常的亮度。
2
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。
3
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.