除了定居点和有水的地区，沙丘还与厚厚的植被接壤(图片左上角和右下角)。
Besides settled and watery areas, the dunes are bordered by thick vegetation (image upper left and lower right).
这张图片实际显示的，是距离火星北极不足240英里的沙丘上覆盖的一层薄薄的冰冻二氧化碳、或干冰。
The photographs actually show sand dunes coated with a thin layer of frozen carbon dioxide, or dry ice, less than 240 miles from the planet's north pole.
这张图片上可以看到由沙子堆积成的数不清的星形沙丘，所有的沙丘都有常常的山脊向各个方向伸展。
This astronaut photo shows sand heaped up in numerous star dunes, each of them with long arms extending in several directions.
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