环月飞行

环月飞行的月球卫星轨道则与地球卫星轨道有很多不同之处，它决不是地球卫星轨道的简单克隆。

The final orbit around the Moon is not the clone of the Earth satellites ' orbit though they are similar in some aspects .

月球探测器的运动通常可分为3个阶段，这3个阶段分别对应3种不同类型的轨道：近地停泊轨道、向月飞行的过渡轨道与环月飞行的月球卫星轨道。

The motion of lunar probe consists of three stages including three different type of orbits : parking orbit near the Earth , transfer orbit forward to the Moon and the final orbit around the Moon .

苏联早在1966年就实现了人类首次环月飞行和软着陆，而美国在1969年实现了载人登月，是迄今唯一有此成就的国家。

The Soviet Union achieved the first orbit and first soft landing on the Moon , in 1966 , but the US is the only nation to land a person on the satellite , in 1969 .

轨道器和返回器组合体将继续在平均高度约200公里的环月轨道上飞行并等待上升器交会对接，着陆器和上升器组合体将择机实施月面软着陆，进行自动采样等后续工作。

The lander-ascender combination will execute a soft landing on the moon and engage in automatic sampling . The orbiter-returner will continue orbiting about 200 km above the lunar surface and wait for rendezvous and docking with the ascender .