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| 11. | decline disease |
| 衰退病 |
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| 12. | flattop decline |
| 平顶降落 |
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| 13. | precipitous decline |
| 迅速递减 |
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| 14. | production decline |
| 产量递减 |
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| 15. | natural decline |
| 自然递减 |
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| 16. | decline characteristic |
| 递减特性 |
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| 17. | pressure decline |
| 压力下降 |
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| 18. | decline fraction |
| 递减段 |
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| 19. | hyperbolic decline |
| 双曲型衰减 |
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| 20. | fertility decline |
| 生育率下降 |
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