全部

1·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。

2·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。

3·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。

4·A pendulum vibrates seconds.

钟摆摆动计秒。

5·You can experiment with it if you wish; and perhaps you can find out how long a pendulum must be to vibrate once in two seconds.

假如愿意的话，你可以用它来做试验，也许你就会算出，钟摆每两秒钟摆动一次的摆长应该是多少。

6·A pendulum vibrates seconds.

钟摆来回地摆动。