土卫一，土星的一颗较小的卫星，却炫耀着全太阳系最大的撞击坑之一的赫歇尔环形山。
Mimas, one of the smaller round moons of Saturn, sports Herschel crater, one of the larger impact craters in the entire Solar System.
盖尔环形山最明显的特征就是陨坑中间突兀的耸立着一座塔状的岩堆。
This site's most obvious feature is a towering pile of materials that sits smack in the middle of the wide crater.
简单环形山形状好像一个碗，复杂环形山则有一个小山丘在陨坑中间，这个小山丘是由撞击后物质反弹所形成。
The simple crater has a bowl shape. The complex crater has a small hill at the center, which was caused by the rebound of the material at the center.
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