插脚，犹插身。语出陆游 《鹧鸪天》词：“插脚红尘已是颠，更求平地上青天！”
通常您无需轮询没有连接传感器的插脚处的电压。
Normally you don't poll voltages at pins that have no sensors connected to them.
光照越强，Arduino 在连接插脚处读取的电压越多。
The greater the intensity of the light, the more voltage the Arduino sees at the connected pin.
并非所有的插头都有三个插脚，某些工具的插头只有两个插脚。
Not all plugs are three pronged and some tools have only a two prong plug.
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