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21. | asronomical parallel |
| 天文纬线 |
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22. | fictitious parallel |
| 虚纬线 |
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23. | pseudo parallel |
| 假平行的 |
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24. | bounding parallel |
| 图廓纬线 |
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25. | parallel Block |
| 平行垫块 |
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26. | geographic parallel |
| 地理纬圈 |
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27. | spacer parallel |
| 垫块 |
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28. | astronomical parallel |
| 天球纬度圈 |
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29. | optical parallel |
| 光学平行 |
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30. | historic parallel |
| 历史的类比 |
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