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。
With the right amount of sleep you should wake up fresh and alert five minutes before the alarm rings.
有了适量的睡眠，你就应该在闹钟响前的五分钟精神抖擞地醒来。
This is not about creating alarm but helping children be more alert and careful.
这不是关于制造惊慌，而是帮助儿童更加警惕和谨慎。
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