Mimas, at the upper right, has an enormous impact crater on one side, and Tethys, at the bottom, has a huge rift zone called Ithaca Chasma that runs nearly three-quarters of the way around the moon.

右上角的是土卫一，在它上面的一边上，有着一个巨大陨石坑；底部的是土卫三，上面有一个巨大的、称为伊萨卡峡谷的裂谷带，它几乎占了该卫星绕行路线的四分之三。

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When the rocket struck the bottom of the crater on October 9 last year it blasted out a hole 70ft to 100ft indiameter and 6ft deep.

去年10月9日，火箭按计划成功撞击到月球坑，坑底产生了一个直径为70-100英尺、6英尺深的大洞。

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More importantly from the point of view of space exploration, largeamounts of water were discovered at the bottom of the Cabeus crater.

不过对于空间探索来说更具意义的是，在被撞击的凯布斯月球坑的底部发现了大量的水。

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The bottom of the crater, by contrast, is perpetually dark and, with luck, ice-bound.

ECONOMIST: Spaceflight

Detailed studies of the surface indicate that these were formed by a lake caused by the flow of underground water that periodically made its way to the bottom of the crater.

FORBES: NASA Finds Remains Of Ancient Martian Lake