Half of your brain stays alert and prepared for danger when you sleep in a new place, a study has revealed.

一项研究表明，当你在一个陌生的地方睡觉时，你的半边大脑会保持警觉并做好准备防范危险。

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If they detect something wrong while the system is armed, they'll transmit a wireless alert signal to a base station that will then raise the alarm.

如果他们在系统布防时发现了什么问题，就会向基站发送无线警报信号，然后基站会发出警报。

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A warning alert indicates a non-critical condition that might indicate a non-optimal system, while an alarm alert is a critical condition requiring immediate action.

提醒警报指明了一个非临界条件，这类警报可能意味着当前系统不是最优化的，而报警警报指明的是临界条件，要求立即采取行动。

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The alert was issued after the kidnapping and rescue of a New York Times reporter in Kunduz province.

VOA: standard.2009.09.10

This is more of a spoiler alert, but you've had 41 years to see this movie.

它不只是一个扰流警报，但是你用了41年来看这个电影。

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Because it's a very intense job they have to be alert every moment.

因为是高度集中的工作,他们需要时刻保持警惕。

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"Some people have questioned, 'well, you put us on a general alert a couple of weeks ago and nothing happened, '" Ridge said.

CNN: Americans urged to carry on despite terror alert

Mr. MAYS: Well, there are a couple: There was a First Alert Kit and a PRO-LAB Lead Surface Kit.

NPR: Do Home Lead-Testing Kits Work?

His translation to TMS commentator - frustratingly late for his taste - came in 1974, appropriately at Headingley, but as he took the microphone for the first time a bomb alert brought a suspension in play.

BBC: Don Mosey