Motion detector
01
运动检测器, 动作感应器
a device that detects the presence of movement within a specific area and can trigger an alarm or other action as a result
例子
The motion detector in the hallway turned on the lights as soon as I walked past.
走廊里的运动检测器在我走过时立即打开了灯。
The security system uses a motion detector to monitor any movement around the house.
安全系统使用运动检测器来监控房屋周围的任何运动。
