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| 71. | bore from within |
| 从内部动摇并破坏 |
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| 72. | large-bore engine |
| 大缸径发动机 |
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| 73. | gun bore scavenger |
| 炮膛吹气装置 |
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| 74. | exploratory bore-hole |
| 勘探钻孔 |
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| 75. | multi-bore well |
| 多底井 |
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| 76. | bore face machine |
| 镗孔锪端面加工机床 |
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| 77. | cylinder bore gauge |
| 缸径规 |
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| 78. | bore of cylinder |
| [印]花[滚]筒芯孔 |
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| 79. | bore and stroke |
| 缸径与行程 |
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| 80. | entrance bore gauge |
| 口内径卡规 |
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