The road passes over a steep mountain.

这条路翻越一架陡峭的高山。

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Potatoes and tobacco are grown in Andorra's steep mountain valleys.

安道尔陡峭的山谷里种植着土豆和烟草。

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Horses bore supplies up the steep mountain.

马匹驮着供应品走上陡峭的山路。

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The town lay on a flat plain at the base of an Allegheny Mountain valley so steep that the hillsides rose straight upward along the Little Connemaugh River.

VOA: standard.2010.04.26

The coach crashed as it travelled down a steep mountain road, which features 21 hairpin bends.

BBC: Scene of French Alps coach crash

We have a steep mountain to climb, and we started in a very deep valley.

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That night, I slept on it in our quaint wood cabin perched on the steep mountain face.

WSJ: Tom Rob Smith Climbs Mount Fuji | Traveler's Tale