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11. | a parachute descent |
| 降落伞的下降 |
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12. | descent propulsion |
| 下降推进 |
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13. | descent velocity |
| 下降速度 |
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14. | strictly descent method |
| 严格下降方法 |
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15. | uterine descent |
| 母系 |
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16. | transmissible by descent |
| 可凭世系传给下一代 |
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17. | descent function |
| 下降函数 |
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18. | terminal descent guidance |
| 末段下降制导 |
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19. | recursive descent |
| 递归下降 |
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20. | gravity descent tool |
| 靠重力下井工具 |
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