N rock forming the boundaries of a sandy or gravelly alluvial deposit 顶岩; 悬崖
NASA's Mars Reconnaissance Orbiter has detected clay in rock of the crater rim exposed by the far larger impact explosion that created Endeavour.
美国宇航局的火星勘测轨道飞行器已经探测到这个陨石坑边缘岩石中的粘土，而这些粘土来自于远大于床在奋进陨石坑的大爆炸。
Harry watched nervously as the tips of Dumbledore's buckled shoes found the utmost edge of the rock rim.
邓布利多慢慢挪向湖边，哈利紧张地注视着邓布利多带铜扣的鞋尖挪到了岩石边缘的最外面。
Occasionally a swell rolled smoothly over the rim of the rock.
偶尔，会有一朵浪花卷上岩石。
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