... planetary nebulae ==> 行星状星云 planetary operations ==> 星际飞行 planetary orbit ==> 行星轨道 ...
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planetary operations
行星的操作
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Off-world settlements will provide fuel and life support materials for space missions and planetary operations, and for return of goods to Earth.
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