... free-pendulum clock 肖特钟 second pendulum clock 秒摆时钟 pendulum clock earring 时间表两用耳环 ...
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"The atomic clock is actually putting out an electronic signal which is essentially analogous to the ticking of a pendulum clock... which might tick once every second or once every couple of seconds, " says Dr McCarthy.
BBC: Meet the world's director of time
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