Most of these streaks are darker than the surrounding sand.
这些条痕大多数都比周围的沙子更暗。
In this image streaks of dark basaltic sand have been carried frombelow the ice layer to form fan-shaped deposits on top of the seasonalice.
在这幅图像中黑色玄武岩沙带被从冰层下面显露出来，在季节性冰盖的顶部形成扇形堆积。
The dark streaks are escaping sand.
暗条纹是漏出的沙子。
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