security lights with an infrared sensor (= that come on when a person is near them) 带红外线传感器的保安灯
a device that can react to light, heat, pressure, etc. in order to make a machine, etc. do sth or show sth (探测光、热、压力等的)传感器,敏感元件,探测设备:
15秒记一个单词（第1210个）sensor
