名词
中文翻译：行星环
同义词：
['planetary ring', 'planetary ring structure', 'planetary ring formation']
例句：
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1. The discovery of a new planetary ring has sparked excitement among astronomers.
发现一个新的行星环让天文学家们兴奋不已。
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2.The study of planetary rings is crucial for understanding the formation and evolution of celestial bodies.
研究行星环对于理解天体的形成和演变至关重要。
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3. The planetary ring system is a fascinating example of how the solar system was formed.
行星环系统是一个令人着迷的例子，展示了太阳系是如何形成的。