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| 21. | The pendulum clock was invented in 1657. |
| 钟摆是1657年发明的。 |
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| 22. | Watched the pendulum wigwag. |
| 观察钟摆的摆动 |
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| 23. | the to - and - fro of a pendulum |
| 钟摆的往复摆动 |
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| 24. | gyroscopic and pendulum electronic control |
| 回旋及钟摆电子控制 |
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| 25. | clock, wall, pendulum |
| 装有钟摆的挂钟 |
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| 26. | the swing of the pendulum n. |
| 钟摆的摆动；盛衰；消长 |
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| 27. | pendulum drill assembly |
| 钟摆钻具组合 |
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| 28. | A pendulum vibrating seconds. |
| 钟摆以摆动指示秒数。 |
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| 29. | A pendulum vibrates seconds. |
| 钟摆摆动计秒。 |
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| 30. | pendulum bottomhole assembly |
| 钟摆井底钻具组合 |
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