名词
中文翻译：存在探测器
同义词：
['presence meter', 'presence sensor', 'presence monitor']
例句：
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1. The presence detector was designed to detect the presence of a specific person in a room.
这个存在探测器被设计用来检测特定人在房间的存在。
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2.The presence detector is used to monitor the presence of people in a building.
存在探测器用于监控建筑物中人员的存在。
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3. The presence detector detected an unusual presence in the room.
存在探测器探测到了房间中不寻常的存在。