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| 31. | natural decline |
| 自然递减 |
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| 32. | You can coast downhill on a bicycle. |
| 你可以骑自行车滑下坡。 |
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| 33. | retarder control |
| （下坡）缓速器操纵件 |
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| 34. | hyperbolic decline |
| 双曲型衰减 |
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| 35. | A bicycle can go fast downhill. |
| 自行车下坡时可以跑得很快。 |
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| 36. | precipitous decline |
| 迅速递减 |
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| 37. | harmonic decline |
| 调和递减 |
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| 38. | pressure decline |
| 压力下降 |
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| 39. | flattop decline |
| 平顶降落 |
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| 40. | decline characteristic |
| 递减特性 |
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