1954年，修建川藏公路的筑路战士在怒江两岸的悬崖陡壁上开山修路。1954年建成通车的川藏公路全长2400多公里，平均海拔3000米，翻越14座大山，是中国公路史上工程最为艰巨的一条路。（张加里摄）

    Soldiers work on the cliff along the Nujiang River to construct the Sichuan-Tibet Highway in 1954. The Sichuan-Tibet Highway started construction in April of 1950 and was open to traffic in Dec. 1954. With an average altitude of over 3,000m, the 2,413-km-long highway winds through 14 mountains.（Photo by Zhang Jiali)