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51. | water-table decline |
| 地下水面下降 |
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52. | monthly decline rate |
| 月递减率 |
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53. | composite decline curve |
| 综合递减曲线 |
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54. | To decline steadily |
| 江河日下 |
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55. | logarithmic decline curve |
| 对数递减曲线 |
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56. | natural production decline |
| 产量自然递减 |
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57. | decline an order |
| 谢绝订货 |
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58. | to politely decline |
| 辞让 |
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59. | normal decline fraction |
| 正常递减率 |
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60. | Descend; decline; drop: |
| 滑坡 |
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