Zhu is imitating the blare of police sirens in his native Beijing. Like the flash of magnesium in contact with air, the subject of law and order causes a similar reaction.

朱伟正在模仿的是他的家乡北京的警笛声，就像镁接触到空气时的闪光一样，关于法律和秩序的话题也引起了他类似的反应。

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Recent headlines blare like warning sirens: oil prices soar to pre-recession heights and proceed relentlessly higher.

FORBES: Oil Spikes, Double Dips And Dilapidated Dollars