By the 16th century, a pendulum clock had been devised, but the pendulum swung in a large arc and thus was not very efficient.

到了16世纪，人们发明了摆钟，但钟摆摆动的幅度很大，因此效率不高。

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That's how the clock runs, by the pendulum moving from one extreme to the other.

时钟的工作就是依靠钟摆从一个极端摆向另一个极端。

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If the pendulum stops in the middle, it will be the coolness of love; and if the pendulum stops in the middle, the clock will also stop.

如果钟摆停在中间，那就是爱的清凉；如果钟摆停在中间，时钟也停下不走了。

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To stand without moving and say 'Here it comes,there it goes,' as the clock's pendulum swings back and fore."

VOA: special.2011.03.05

"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

Then in 1656, Dutch mathematician Christiaan Huygens made the first working pendulum clock, accurate to an error of less than one minute per day.

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Skeleton clocks display the interior mechanisms of the timepiece, while mystery clocks, like the 1890 enamel and glass French timepiece showing a fetching young lady holding a pendulum clock, hide their mechanisms, thus presenting a mystery as to what makes them tick.

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