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| 21. | Extraterrestrial gravity estimates |
| 天体重力估算 |
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| 22. | extraterrestrial environment |
| 行星际环境 |
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| 23. | extraterrestrial inteligence |
| 地外智慧 |
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| 24. | extraterrestrial solar radiation |
| 地外日射 |
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| 25. | extraterrestrial topography |
| 天体形貌学 |
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| 26. | E.T. the Extra-Terrestrial |
| 外星人 |
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| 27. | extraterrestrial civilization |
| 地外文明 |
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| 28. | extraterrestrial solar irradiance |
| 地外日辐照度 |
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| 29. | extraterrestrial noise |
| 地外噪声 |
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| 30. | extraterrestrial life exploration |
| 地外生命探索 |
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