研究了太阳质量损失对地球轨道改变的长期影响。

The author investigates the secular influence of solar mass-loss on the change of the orbit of the earth.

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火星和地球的轨道随着时间而发生改变。

Mars and Earth have orbits which change with time.

《柯林斯英汉双解大词典》

当行星绕太阳运行时，其轨道椭圆的主轴每次都会改变。

The main axis of the planet's orbital ellipse shifts each time when it goes around the sun.

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