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21. | doctrine of descent |
| 世代延续说 |
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22. | recursive descent |
| 递归下降 |
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23. | transmissible by descent |
| 可凭世系传给下一代 |
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24. | method of descent |
| 降维法 |
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25. | a parachute descent |
| 降落伞的下降 |
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26. | gravity descent tool |
| 靠重力下井工具 |
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27. | terminal descent guidance |
| 末段下降制导 |
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28. | descent control device |
| 缓降器 |
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29. | strictly descent method |
| 严格下降方法 |
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30. | recursive descent parser |
| 递归下降分析程序 |
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