n.擺錘;鐘擺;搖擺不定
A pendulum oscillates. 擺錘能擺動。
The pendulum swings with great regularity. 鐘擺很有規(guī)律地擺動著。
Since the last election, the pendulum of public opinion has swung back against the government. 自從上次大選以來,公眾輿論又轉(zhuǎn)回到反對政府。