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