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1. The river flows through a deep intramontane trough, providing habitat for many species of fishand plants.
这条河流流经一个深的内蒙地沟，为许多鱼类和植物提供了栖息地。
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2. Due to the steep terrain and limited access, this area is prone to flooding in the event of heavy rainfall, making it an intramontane trough that requires careful management.
由于地形陡峭且通行不便，一旦发生强降雨，这个地区容易发生洪水，因此需要谨慎管理。
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3. The construction of this tunnel will significantly reduce traffic congestion in the intramontane trough, improving travel efficiency.
修建这条隧道将大大减少内蒙洼地中的交通拥堵，提高旅行效率。