他们发现棕色的外壳由大量的沟状结构组成，它们能把太阳光转换成散射光线。
They found that the brown shell is made of an array of grooves that split sunlight into diverging beams.
塔西斯高地被巨大的沟壑所包围，这种辐射状地貌向外蔓延了数百英里，被称为槽沟。
Tharsis is surrounded by Titanic gouges in the landscape radiating outwards for hundreds of miles, known as fossae.
就在我们远眺处的下方，黝黑的沟状脊代表了另外一种50万年的沉积层，更远处铺满了玄武岩，520万年前，这块巨大的平原被淹没在火山岩浆之中。
Below us dark, gullied ridges held another half million years of sediments. Beyond them was the basalt, laid down when this vast plain was swamped in lava, 5.2 million years ago.
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