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| 41. | terminal descent guidance |
| 末段下降制导 |
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| 42. | A female descendant. |
| 女性后裔 |
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| 43. | biparental progeny |
| 双亲后裔 |
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| 44. | gravity descent tool |
| 靠重力下井工具 |
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| 45. | progeny test |
| 后裔测定 |
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| 46. | a parachute descent |
| 降落伞的下降 |
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| 47. | descend through the male line |
| 父系后裔 |
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| 48. | strictly descent method |
| 严格下降方法 |
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| 49. | transmissible by descent |
| 可凭世系传给下一代 |
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| 50. | doctrine of descent |
| 世代延续说 |
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