科学家们甚至已经设计了人工开关，当它开启时能够发光和者发出电化学或生物化学信号。
Scientists have even engineered artificial switches to start glowing or giving off some kind of electrochemical or biochemical signal once they are switched "on."
最简单的例子是开关(输入)和发光二级管(输出)。
The simplest examples are switches (inputs) and LEDs (outputs).
一旦所有三个开关打开(按顺序)的主灯将发光红色。
Once all three switches are turned on (in order) the Main light will glow red.
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