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| 21. | swung the car over. |
| 转动汽车 |
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| 22. | counter crankshaft rotation |
| 反曲轴转动方向的转动 |
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| 23. | steady rotation |
| 定常转动|等角速度转动 |
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| 24. | Wheels turn. |
| 车轮转动。 |
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| 25. | a movable control knob or other device on a radio or television receiver used to change the frequency. |
| 收音机或电视机用来转换频率的转动控制钮或其它装置. |
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| 26. | To rotate or revolve. |
| 旋转，转动 |
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| 27. | pole of rotation |
| 转动极 |
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| 28. | To turn or stick up. |
| 转动，竖立 |
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| 29. | To spin;twirl. |
| 转动，旋转 |
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| 30. | infinitesimal rotation |
| 无穷小转动 |
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