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31. | decline fraction |
| 递减段 |
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32. | precipitous decline |
| 迅速递减 |
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33. | natural decline |
| 自然递减 |
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34. | fertility decline |
| 生育率下降 |
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35. | pressure decline |
| 压力下降 |
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36. | decline disease |
| 衰退病 |
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37. | hyperbolic decline |
| 双曲型衰减 |
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38. | production decline |
| 产量递减 |
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39. | decline characteristic |
| 递减特性 |
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40. | decline penalty |
| 放弃罚球权利 |
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