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

Well-run pendulum clocks in the 1660s differed by only about 15 seconds a day. Non-pendulum clocks of the same era (ones that used rotating wheels) varied by about 15 minutes a day.

在17世纪60年代，一台运行良好的摆钟一天的误差只有15秒，而同时期的非摆钟的钟表(即采用回转轮的钟表)运行一天则有15分钟的误差。

youdao

Balthazar's Pendulum: decreased duration to 5…10 seconds.

巴萨泽的震荡： 减少持续时间至5。.10秒。

youdao

"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