名词
中文翻译：杆位移指示器
同义词：
['rod motion detector', 'rod motion sensor']
例句：
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1.The rod-motion indicator is used to detect the movement of objects in a room.
杆位移指示器用于检测房间内物体的运动。
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2.The rod-motion indicator was designed to alert us when someone entered the room.
杆位移指示器被设计成在有人进入房间时发出警报。
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3. The rod-motion indicator helped us to identify the source of the noise in the basement.
杆位移指示器帮助我们确定了地下室噪音的来源。