... 绕行星返地轨道 swing-around trajectory 绕月轨道 circumlunar trajectory 热辐射被动寻的制导 heat passive homing guidance ...
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然后，他们返回绕月轨道上的指令舱，开始返回地球。
Then they returned to the orbiting command module and started back to earth.
这艘无人驾驶的航天器发射于1966年3月31日，并在两天后进入绕月轨道运行。
The unmanned probe launched March 31, 1966, and entered orbit around the moon two days later.
但是相比太空飞船，卫星着陆时需要相对小的速度，这将需要三天的时间，意味着消耗更少的燃料进入绕月轨道。
But the satellites will arrive with less relative speed than spacecraft making the trip in three days, which means less fuel will be needed to brake and drop into lunar orbit.
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