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ellipses
An ellipse is an oval shape similar to a circle but longer and flatter.
The Earth orbits in an ellipse.
地球绕一椭圆轨道运行。
Every known comet orbits the sun, although most of them move in extremely elongated ellipses.
所有已知的彗星都绕太阳运行，但它们的轨道大部分都呈极狭长的椭圆形。
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