a weight hung from a fixed point so that it can swing freely backwards and forwards, especially a rod with a weight at the end that regulates the mechanism of a clock
摆;钟摆。
〈喻〉 摇摆不定的事态(或局面)
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the pendulum of fashion .变幻莫测的流行式样。
"mid 17th cent.: from Latin, neuter (used as a noun) of