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| 51. | coast performance |
| 反拖特性 |
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| 52. | an additional interior fortification to prolong the defense. |
| 为延长防线而在内部附加的一个防御工事。 |
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| 53. | maintain the vigour of youth and prolong life |
| 青春常驻，延年益寿 |
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| 54. | dextral drag fold |
| 右拖褶曲 |
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| 55. | Good care may prolong a sick person's life. |
| 好的照顾可延长病人的生命。 |
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| 56. | hand carriage wheel |
| 拖扳手轮 |
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| 57. | To lag behind. |
| 落后拖在后面 |
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| 58. | streaking effect |
| 拖尾效应 |
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| 59. | hauling rod wheel |
| 拖杆轮 |
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| 60. | deep-towed devices |
| 深拖设备 |
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