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| 41. | airplane flutter |
| 飞机颤动干扰 |
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| 42. | A trembling or shaking. |
| 颤动，悸动 |
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| 43. | The act of pulsating. |
| 颤动的行为 |
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| 44. | broad band random vibration |
| 宽带随机颤动 |
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| 45. | an unsteady voice. |
| 颤动的噪音 |
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| 46. | valve spring surge |
| 汽门弹簧颤动 |
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| 47. | flutter checker |
| 颤动检验器 |
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| 48. | chatter of brushes |
| 电刷的颤动 |
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| 49. | vibratile spine |
| 颤动小棘 |
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| 50. | Characterized by vibration. |
| 具有颤动特征的 |
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