• If the temperature drops below a certain level it sends a signal, 'turn on the heat', and that signal stays on until it gets a negative signal to turn off.

    如果温度降到一定程度以下时,探测器会发送一个信号,打开加热器,直到加热器再收到关闭的信号,它就会一直开着

    耶鲁公开课 - 生物医学工程探索课程节选

  • Now this is a rain gauge, and it's sitting on a roof of a building, and when the water falls into this gauge, it sends a signal to the logic unit of the computer, which immediately notifies the memory bank of the computer to seek out its instructions for a rainy day.

    这是一个雨量测量器,安装在一个楼房的,屋顶上,当水流入到这个测量器,它就给计算机的逻辑部件发送一个信号,计算机立即通知内存条,为下雨天找出相应的指令。

    哈佛公开课 - 计算机科学课程节选

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