单词：cratering
cratering的用法和样例：
例句
- A flat-bottomed, roughly circular volcanic crater of explosive origin that is often filled with water.小火山口一种底部平坦、大致呈圆形的火山爆发后形成的盛满水的低洼地
- A rim, as of a vessel, bell, or crater.边容器、铃和坑的边缘
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Altogether it is thoughtthough it is really only a guess, based on extrapolating from cratering rates on the Moon, 据认为──虽然只是根据月球上形成凹坑的速度所作的一种推测， that some two thousand asteroids big enough to
万物简史