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21. | establish the border |
| 规定边界 |
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22. | solar wind boundary |
| 太阳风边界 |
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23. | drawing Boundaries |
| 图形边界 |
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24. | infinite boundary |
| 无穷远边界 |
|
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25. | theoretical boundary |
| 理论边界 |
|
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26. | sector boundary |
| 扇形边界 |
|
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27. | territorial border |
| 领地边界 |
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28. | edge reflection |
| 边界反射 |
|
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29. | stratigraphical boundary |
| 地层边界 |
|
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30. | singular boundary |
| 奇异边界 |
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