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| 61. | family origin,descent |
| 家庭出身,门第 |
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| 62. | angle of descent |
| 降落角度 |
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| 63. | a steep descent |
| 陡峭的坡道 |
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| 64. | single seed descent |
| 单粒传法 |
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| 65. | line of descent |
| 系谱 |
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| 66. | descent propulsion system |
| 降落推进系统 |
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| 67. | a rapid descent |
| 急陡的下坡 |
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| 68. | steep descent algorithm |
| 陡降算法 |
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| 69. | descent of piston |
| 活塞下行 |
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| 70. | canons of descent |
| 不动产继承顺序 |
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