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21. | rocking oscillation |
| 摇摆振动 |
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22. | phase of oscillation |
| 摇摆相位 |
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23. | a swing Band |
| 摇摆乐队 |
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24. | sloping-peaked type ceiling |
| 尖顶斜面型天花板 |
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25. | oscillating turret |
| 摇摆炮塔 |
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26. | rocking ball bearing |
| 摇摆滚珠轴承 |
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27. | oscillatory characteristic |
| 摇摆特性 |
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28. | An act of tumbling;a fall. |
| 摇摆;跌倒 |
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29. | swinging grinding machine |
| 摇摆研磨机 |
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30. | transition tip-line anticline |
| 过渡型尖顶背斜 |
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