Pendulum



GRE 考研

解释

GRE 红宝书

• n. 摆, 钟摆
• ［记］ pend ( 挂) ＋ulum -> 挂的东西 -> 钟摆

Webster Collegiate

noun

• Etymology: New Latin, from Latin, neuter of pendulus
• Date: 1660
• 1. a body suspended from a fixed point so as to swing freely to and fro under the action of gravity and commonly used to regulate movements (as of clockwork)
• 2. something (as a state of affairs) that alternates between opposites

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