1. Sometimes it is a little more circular, sometimes it is more elliptical. 有时它更圆一点，有时它更像椭圆。
2. When Earth's orbit is more elliptical, Earth is actually closer to the sun during part of the year. 当地球的轨道更接近椭圆时，地球实际上在一年的一部分时间里更接近太阳。
3. Astronomers suspect that pairs of planets also engage in this slingshot activity, leaving them in disturbed, elliptical orbits. 天文学家怀疑成对的行星也参与了这种弹弓活动，使它们处于不规则的椭圆轨道上。
4. Under the control of the Sun's gravitational force, each planet maintains an elliptical orbit and all of them travel in the same direction. 在太阳引力的控制下，每个行星都维持在一条椭圆形的轨道上，并按照相同的方向移动。
5. Comets formed in circular orbits but were gravitationally flung into their present-day elliptical orbits when they ventured too close to planets. 彗星在圆形轨道上形成，但当它们冒险太接近行星时，就会被引力抛入现在的椭圆轨道。
