Deimos has a smooth surface due to a blanket of fragmental rock or regolith, except for the most recent impact craters.

火卫二因碎屑岩或风华层的覆盖而表面光滑，除了最近的撞击坑。

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Deimos has a smooth surface due to a blanket of fragmental rock or regolith, except for the most recent impact craters.

火卫二因碎屑岩或风华层的覆盖而表面光滑，除了最近的撞击坑。

youdao