此外，在没有直接可用的显示时，还可以用声音来向系统提供信号和反馈。
Besides, sometimes sound can be used to offer signals and feedback on a system when no display is immediately handy.
在一张地图上，闪光的红点提供信号显示可能不久就会出现犯罪情况的那条街区。
A red dot flashing on a map signals that a crime may happen on that block soon.
贴在飞行员头皮上的电极为电脑提供信号，这些信号表达了足够让电脑按照他们想法工作的信息。
Signals from electrodes taped to the scalp of such pilots provide enough information for a computer to work out exactly what the pilot wants to do.
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