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| 1. | bottom perforation |
| 底部炮眼 |
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| 2. | bottom boundary |
| 底部边界层 |
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| 3. | bottom reflector |
| 底部反射体 |
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| 4. | reach the bottom |
| 到达底部 |
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| 5. | bottom settlings |
| 底部沉淀 |
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| 6. | bottom traction |
| 底部牵引力 |
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| 7. | bottom subsidence |
| 底部沉陷 |
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| 8. | bottom reinforcement bars |
| 底部钢筋 |
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| 9. | bottom ionosphere |
| 底部电离层 |
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| 10. | bottom draw cut |
| 底部掏槽 |
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