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81. | equatorial orbit |
| 赤道轨道 |
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82. | orbit modification |
| 轨道变更|轨道修正 |
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83. | orbit utilization |
| 轨道使用 |
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84. | instantaneous orbit |
| 瞬时轨道 |
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85. | disturbed orbit |
| 受摄轨道 |
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86. | photocentric orbit |
| 光心轨道 |
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87. | molecular orbit |
| 分子轨道 |
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88. | equilibrium orbit |
| 平衡轨道 |
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89. | permissible orbit |
| 允许轨道 |
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90. | undisturbed orbit |
| 无摄轨道 |
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