That could be because the collision that made the moon in the first place was so hot that volatile elements like hydrogen, a key component of H2O, largely burned away.
这可能是因为月球形成过程中，撞击产生的热能使挥发性氢元素——水的重要组成成分——大量流失。
A key task for Fedor will be to 'assist in construction and use of bases' on the moon and potentially other planets, said its Russian designers FPI.
俄罗斯设计团队FPI表示，费多尔的关键任务将是“协助建设和使用月球以及其他潜在行星上的基地”。
The ability to conduct a space walk is key to a longer-term goal of assembling a space lab and then a larger space station, and maybe one day making a landing on the moon.
太空行走能力对于组建太空实验室，以及更大的空间站，乃至将来登陆月球等长期目标至关重要。
The robotic mission is a key first step in NASA's plans to return to the moon as it will survey the lunar surface for landing areas and look beneath the surface for natural resources.
这个机器人的任务是美国国家航空和航天管理局计划重返月球的关键性的第一步，因为它将调查月球表面的降落区域，并且查看表面之下的天然资源。
Since hydrogen is a key element of water, it stands to reason that the Moon possesses relatively little water.
而氢是水的重要组成元素，所以月球含水量相对较少也就理所当然了。
Is it true that the moon was one of the the specific key elements for the electronic fence that was around the earth?
月球是否是周围地球的电子防护栏中关键元素之一呢？
Your key planet Saturn is conjunct the New Moon, placing roadblocks in your way.
今天你的守护星土星与新月合相，在你的道路上设置了障碍。
Another key purpose that our moon serves is that its gravitational force stabilizes earths axis with respect to earths plane of orbit around the sun.
月球也有另一个主要功用：它的引力使地球的轴心跟地球绕太阳运行的轨道平面保持一定的倾斜度。
Another key purpose that our moon serves is that its gravitational force stabilizes earths axis with respect to earths plane of orbit around the sun.
月球也有另一个主要功用：它的引力使地球的轴心跟地球绕太阳运行的轨道平面保持一定的倾斜度。
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