单词：elliptic orbit
elliptic orbit的用法和样例：
例句
- Pluto has an elliptic orbit.冥王星的轨道是椭圆形的。
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我们今天学的词是：planet。Planet是行星。不过你听说了吗，太阳系中排行第九的行星冥王星Pluto被降级了。Astronomers' reclassification strips ninth planet of status in solar system. 国际天文学会对行星重新定
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