老式座钟的摆锤有节奏地左右摆动。
The old clock's ___pendulum swung rhythmically from side to side.
物理课上，我们研究了不同长度的摆锤如何影响摆动速度。
In physics class, we studied how different lengths of ___pendulums affect their swinging speed.
政治风向就像钟摆一样在左右之间不断摇摆。
The political climate swings like a ___pendulum between left and right.
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