Four pins means you can have four sensors, say two temperature sensors, one for ambient and the other for panel temperature, a light sensor, and a wind speed sensor.
四个插脚意味着可以有四个传感器，比如两个温度传感器(一个用于外界温度，一个用于面板温度)、一个光传感器和一个风速传感器。
Sensors constantly monitor temperature and humidity, as well as ambient light and activity near the device or farther away in the house.
恒温器上的传感器会不停监测温度、湿度、环境光以及设备周边和房间里远离设备的其它动静。
Smartphones are packed with sensors, measuring everything from the user's location to the ambient light.
智能手机里满是传感器，不管是用户的位置还是背景灯光的强弱，一切的一切它都能测量出来。
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