科研之友
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摘要
<正>In 1972,villagers of a mountain village performed one of the most miraculous1 feats2 in road-building history:They chiseled3 a tunnel more than 1,200 meters through a mountain for easier access4 to the outside world.Here,"easier"means easier than tiptoeing along a rocky footpath worn into the face of the mountain,which is what they had to do before they built the tunnel.
