全电子式信号钟
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electronic signal clock
电子信号钟
以上为机器翻译结果，长、整句建议使用 人工翻译 。
"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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