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| 21. | It can take as long as eight days to rig up rope ladders and to establish supply bases before a descent |
| (make a descent 下降) |
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| 22. | rate-of-descent control |
| 下降率控制 |
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| 23. | rate-of-descent indicator |
| 下降率指示器;爬升率指示器 |
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| 24. | descent of presenting part |
| 先露部下降 |
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| 25. | line of quickest descent |
| 最快速下降线 |
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| 26. | recursive descent data flow analysis |
| 递归下降数据流分析 |
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| 27. | A downward movement; descent. |
| 向下的运动；下降 |
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| 28. | The act of falling; descent. |
| 落落下的动作；下降 |
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| 29. | A descent by stages or steps. |
| 递减，下降一种逐级或逐步的递减，下降 |
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| 30. | The descent made by an aircraft in order to land. |
| 飞机的程序下降飞机为了着陆而作的下降飞行 |
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