这张展示火星表面一个陨坑内沙丘的照片由美国宇航局的HiRiSE(高分辨率成像科学实验)照相机拍摄。
These dunes seen within a crater on the planet were picked out by NASA's High Resolution Imaging Science Experiment (HiRiSE) camera.
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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