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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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。

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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。

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These new models of failed supernovae demonstrate how both normal brightness and extremely dim supernovae are generated from the same basic picture of a nuclear-burning white dwarf star, he added.

FORBES: When A Supernova ... Fizzles

My test taxes the computer more than a normal user and involves keeping Wi-Fi on, cranking the screen to full brightness, turning off all power-saving features, keeping email retrieval going in the background and playing an endless loop of music.

WSJ: A Laptop Screen That Promises an Eyeful