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51. | angle of descent |
| 降落角度 |
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52. | strictly descent method |
| 严格下降方法 |
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53. | gravity descent tool |
| 靠重力下井工具 |
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54. | a steep descent |
| 陡峭的坡道 |
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55. | doctrine of descent |
| 世代延续说 |
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56. | recursive descent parser |
| 递归下降分析程序 |
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57. | descent control device |
| 缓降器 |
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58. | steepest descent algorithm |
| 最速下降算法 |
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59. | method of descent |
| 降维法 |
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60. | minimum descent altitude |
| 最低下降高度 |
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