For decades scientists have been trying to understand why the visible near side of the Moon is covered in craters while the far side has mountain ranges higher than 3, 000 metres.

数十年来科学家们一直试图想搞清为何月球正面布满环形山而背面的山高过3千米。

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The western rift includes the Virunga and Rwenzori mountain ranges and several of Africa's Great Lakes, where the deep rift has filled with water.

裂谷的西侧有维龙加山脉和鲁文佐里山脉以及几个因深深的裂谷充满水而形成的大湖泊。

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This other China has many mountain ranges, thousand kilometre long chains stretching from west to east dividing the land into enclosed plateaus and basins whose rivers never reach any sea.

中国的这一部分有许多山脉，一座又一座绵亘千里，由西向东伸展，把土地分隔成一个个山峦环抱的高原和盆地，其中河流一向不通大海。

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Tucked between the Castle and Little Belt mountain ranges, the ranch has 9, 000 deeded acres, five reservoirs, 3 miles of the trout-rich North Fork of the Musselshell River, and antelope, deer and elk that roam the mix of bald hills and stands of Douglas fir and ponderosa pines.

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Among Germany's lower mountain ranges, the Bavarian Forest has the most reliable snow levels, with plenty of good downhill action on the Grosser Arber mountain.

BBC: Getting fresh in Germany: Cycling, hiking and skiing