At the start of your break, set an alarm clock to remind you when your break is over.
在你准备休息时，设置一个闹钟来提醒你结束休息。
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But viruses know their hosts well-they can break into cells undetected, switch off alarm systems, and undermine the cell's authority in deciding which genes get expressed.
The security cameras and alarm system were alerted and the police immediately came to the house and arrested the intruder who was attempting to break a window when they arrived.