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| 71. | rough hardfacing |
| 粗糙硬化表面 |
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| 72. | aerodynamically rough surface |
| 气动力粗糙表面 |
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| 73. | a crude drawing; |
| 粗糙的画; |
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| 74. | A coarse grain. |
| 粗糙的微粒 |
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| 75. | extremely rough mutant |
| 极度粗糙突变型 |
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| 76. | rough-walled fracture |
| 粗糙壁裂缝 |
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| 77. | asperity contact |
| 粗糙面接触 |
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| 78. | harsh Burlap; |
| 粗糙的麻布袋; |
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| 79. | rough angular quarrystone |
| 粗糙棱角矿石 |
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| 80. | hydraulically rough |
| 水力粗糙的 |
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