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| 21. | The swings back and forth. |
| 秋千前后摇摆。 |
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| 22. | oscillatory characteristic |
| 摇摆特性 |
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| 23. | swinging grinding machine |
| 摇摆研磨机 |
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| 24. | hydraulic oscillating cylinder |
| 液压摇摆油缸 |
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| 25. | rocking ball bearing |
| 摇摆滚珠轴承 |
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| 26. | A wobble or roll. |
| 摇晃或摇摆 |
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| 27. | rocking oscillation |
| 摇摆振动 |
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| 28. | A wobbling motion. |
| 摇摆的动作 |
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| 29. | An act of tumbling;a fall. |
| 摇摆；跌倒 |
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| 30. | average swing angle |
| 平均摇摆角 |
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