当碎片落回撞击坑时，热量可以被保留下来，形成隔热层。

Heat could be retained as debris fall back into impact craters, creating an insulating blanket.

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火星表面显示出广泛的地质特征，包括巨大的火山——太阳系中已知的最大的火山——和广阔的撞击坑。

The surface of Mars shows a wide range of geologic features, including huge volcanoes—the largest known in the solar system—and extensive impact cratering.

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克莱门廷的数据显示：南极撞击坑比预期的反射性更强。

Clementine's data indicated that the wall of the south-polar crater was more reflective than expected.

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