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21. | a steep descent |
| 陡峭的坡道 |
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22. | doctrine of descent |
| 世代延续说 |
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23. | descent control device |
| 缓降器 |
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24. | rate of descent |
| 垂直下降速度 |
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25. | method of descent |
| 降维法 |
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26. | steepest descent algorithm |
| 最速下降算法 |
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27. | recursive descent parser |
| 递归下降分析程序 |
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28. | minimum descent altitude |
| 最低下降高度 |
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29. | angle of descent |
| 降落角度 |
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30. | line of descent |
| 系谱 |
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