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。
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