n.摆锤；钟摆；摇摆不定
A pendulum oscillates. 摆锤能摆动。
The pendulum swings with great regularity. 钟摆很有规律地摆动着。
Since the last election, the pendulum of public opinion has swung back against the government. 自从上次大选以来,公众舆论又转回到反对政府。
