名词
中文翻译：封闭轨道
同义词：
['closed loop', 'closed path']
例句：
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1.The satellite's trajectory is a closed orbit around the Earth.
这颗卫星的轨道是围绕地球的闭合轨道。
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2.The spacecraft's trajectory is a closed orbit around the moon.
宇宙飞船的轨迹是围绕月球的闭合轨道。
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3. The satellite's trajectory is a closed orbit that takes it back to Earth every few months.
这颗卫星的轨道是闭合轨道，每隔几个月就会返回地球。