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| 41. | retrograde orbit |
| 逆行轨道 |
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| 42. | orbit perturbation |
| 轨道扰动 |
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| 43. | orbit prediction |
| 轨道预报 |
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| 44. | planetary orbit |
| 行星轨道 |
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| 45. | heliocentric orbit |
| 日心轨道 |
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| 46. | parabolic orbit |
| 抛物线轨道 |
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| 47. | eccentric orbit |
| 偏心轨道 |
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| 48. | scalloped orbit |
| 扇弧形轨道 |
|
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| 49. | uncompleted orbit |
| 未满轨道 |
|
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| 50. | definitive orbit |
| 既定轨道 |
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