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31. | angle of descent |
| 降落角度 |
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32. | strictly descent method |
| 严格下降方法 |
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33. | gravity descent tool |
| 靠重力下井工具 |
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34. | a steep descent |
| 陡峭的坡道 |
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35. | doctrine of descent |
| 世代延续说 |
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36. | recursive descent parser |
| 递归下降分析程序 |
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37. | descent control device |
| 缓降器 |
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38. | steepest descent algorithm |
| 最速下降算法 |
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39. | method of descent |
| 降维法 |
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40. | minimum descent altitude |
| 最低下降高度 |
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