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A pendulum is a weight that hangs from a fixed point and swings back and forth, again and again, in a smooth line. Old clocks used a pendulum to keep time — each swing took the same amount of time, so it worked like a steady heartbeat for the clock. People also use the word for anything that keeps swinging between two states, like 'public opinion swung like a pendulum, from support to anger and back again.'
鐘擺
組成From Latin 'pendulus,' meaning 'hanging' — from 'pendere,' to hang. The word doesn't split into normal English pieces; it came into English as a whole borrowed word.
原始詞典資料4 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
pendulumnoun/ˈpɛnd͡ʒʊləm/
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engineeringmechanical-engineeringmechanicsA body suspended from a fixed support so that it swings freely back and forth under the influence of gravity, commonly used to regulate various devices such as clocks.
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engineeringmechanical-engineeringmechanicsA body suspended from a fixed support so that it swings freely back and forth under the influence of gravity, commonly used to regulate various devices such as clocks.
- The pendulum can be seen to be swinging in favour of rail, as with each issue of RAIL comes news of further intermodal service expansion.
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A lamp, etc. suspended from a ceiling.
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A watch's guard-ring by which it is attached to a chain.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。