treacherous mountain passes
definitions
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dangerous and unpredictable routes through mountain ranges, often characterized by steep slopes, unstable terrain, or sudden weather changes that pose a risk to travelers.de: gefährliche Gebirgspässe
examples
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The climbers struggled to navigate the treacherous mountain passes during the blizzard.
Die Bergsteiger hatten Schwierigkeiten, die gefährlichen Gebirgspässe während des Schneesturms zu durchqueren.