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| 31. | planetary orbit |
| 行星轨道 |
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| 32. | orbit prediction |
| 轨道预报 |
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| 33. | heliocentric orbit |
| 日心轨道 |
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| 34. | orbit utilization |
| 轨道使用 |
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| 35. | eccentric orbit |
| 偏心轨道 |
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| 36. | retrograde orbit |
| 逆行轨道 |
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| 37. | uncompleted orbit |
| 未满轨道 |
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| 38. | definitive orbit |
| 既定轨道 |
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| 39. | parabolic orbit |
| 抛物线轨道 |
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| 40. | molecular orbit |
| 分子轨道 |
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