单词：planetary system
planetary system的用法和样例：
例句
- Travel to the planetary systems of other stars is a much more formidable undertaking.要航行到其他恒星的行星系中去是件极难实现的事。
- Astronomers today announced the discovery of another planet orbiting a distant star, making it the most crowded planetary system outside our own.天文学家今日宣布发现另一个绕遥远恒星飞行的行星，它是一个最多的行星系中的一员，而不是我们这个行星系。
单词：planetary system 相关文章
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自然百科2008年
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自然百科2012年
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万物简史
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