1·Mars and Earth have orbits which change with time.
火星和地球的轨道随着时间而发生改变。
—— 《柯林斯英汉双解大词典》
2·In molecular orbital theory, we named orbits based on their symmetry.
在分子轨道理论中，我们基于轨道的对称性给它们命名。
3·Let's continue our discussion now by talking about orbits, especially those of the so-called periodic-orbit comets.
现在我们继续讨论，谈谈轨道，特别是那些所谓的周期轨道彗星。
4·The orbits of Mercury, Venus, Earth, Mars, Jupiter and Saturn fit neatly into this pattern; Uranus, discovered in 1781, also obeyed the law.
水星、金星、地球、火星、木星和土星的轨道恰好符合这种模式；1781年发现的天王星也同样符合该定律。
5·They can attain more distant orbits; NASA plans for most of its future earth escaping payloads (to the moon and Mars especially) to carry CubeSats.
它们可以到达更远的轨道；美国国家航空航天局计划在其未来的大部分发射任务（尤其是去月球和火星的）中携带立方体卫星。