passive infrared sensor
被动式红外传感器是用来检测对象的存在或占用。
PIR Sensors are used to detect the presence or occupancy of an object.
youdao
通过对系统的物理结构分析提出了一种被动式红外传感器模型。
After in-depth structure analysis, a passive infrared sensor (PIR) model was presented.
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