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| 51. | mutation frequency decline |
| 突变率下降 |
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| 52. | The car skidded off the road and rolled over and over down the slope . |
| 汽车滑出路面，打着滚翻下坡去。 |
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| 53. | A downward movement or slope. |
| 斜坡向下方的运动或下坡 |
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| 54. | potential decline curve |
| 产量递减曲线 |
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| 55. | The speed of a railway train is often much faster on a down grade. |
| 火车下坡时速度通常快很多。 |
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| 56. | aging memory decline |
| 衰老性记忆下降 |
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| 57. | the sport of skiing across the countryside (rather than downhill). |
| 穿过乡村的滑雪运动（而不是下坡）。 |
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| 58. | primary oil decline |
| 一次采油量递减 |
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| 59. | Step to the downhill side of the trail when encountering pack stock. |
| 礼让负重游人，避到下坡侧等待。 |
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| 60. | hyperbolic decline pattern |
| 双曲线递减型 |
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