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1. The pendulum apparatus is used to measure the angle of a swinging object.
摆锤装置用于测量摆动物体的角度。
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2.The pendulum apparatus was used to detect the presence of a person in the room.
摆锤装置被用来探测房间里是否有人。
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3.The pendulum apparatus was used to study the motion of objects under gravity.
摆锤装置被用来研究物体在重力作用下的运动。