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。
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.
根据下一步操作发出需要的信号拉动系统只会生产恰好多的原料。
The pull system produces only the required material after the subsequent operation signals a need for it.
从智能手机发出信号，一个微型电脑的系统会启动她的引擎，变速器和转向系统——她便能安安稳稳地倒到停车位。
At a signal from a smartphone, a system of tiny computers activates her engine, gearbox and steering-and she reverses smoothly into a parking space.
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