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| 51. | production decline period |
| 产量递减期 |
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| 52. | decline an appointment |
| 拒绝约会 |
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| 53. | decline of sale |
| 销路不佳 |
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| 54. | effective decline rate |
| 有效递减率 |
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| 55. | production decline rate |
| 开采量递减速度 |
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| 56. | yearly decline factor |
| 年递减率 |
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| 57. | phase of decline |
| 衰退期 |
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| 58. | field decline performance |
| 油田递减动态 |
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| 59. | wide-spread decline |
| 大面积滑坡 |
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| 60. | spring ozone decline |
| 春季臭氧衰减 |
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