Ophir Chasma is a large west-northwest-trending trough about 62 miles, or 100 km, wide.

俄斐峡谷是一个宽约62英里，或100公里的，朝向西北偏西方向的大低谷。

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One hypothesis relates the formation of Chasma Boreale to underlying volcanic activity.

有一种猜测认为博勒拉峡谷的成形与火山的地下活动有关。

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China is trying a legalistic defence of the sale of the third and fourth reactors at Chasma.

中国正试图通过法律来捍卫向恰希玛出售第三和第四个反应堆的正当性。

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They were photographed in September 1998 in Chasma Boreale, a giant trough at Mars' north polar cap.

CNN: Scientists debate implications of Mars pictures