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21. | hyperbolic decline |
| 双曲型衰减 |
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22. | A falling object gains momentum as it falls. |
| 物体下落增进动量。 |
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23. | harmonic decline |
| 调和递减 |
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24. | decline disease |
| 衰退病 |
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25. | flattop decline |
| 平顶降落 |
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26. | pressure decline |
| 压力下降 |
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27. | precipitous decline |
| 迅速递减 |
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28. | decline characteristic |
| 递减特性 |
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29. | natural decline |
| 自然递减 |
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30. | decline fraction |
| 递减段 |
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