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So a pendulum one meter long has a period of about two seconds.
因此1米长的钟摆，所用周期是2秒。
youdao
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Two types of watches pendulum and pocket watch were made available during the period.
两种类型的手表和怀表摆提供了在此期间。
youdao
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Two types of watches pendulum and pocket watch were made available during the period.
两种类型的手表和怀表摆提供了在此期间。
youdao