Fenghuoshan tunnel is the highest tunnel in the world with unique geological and climatic conditions and great difficulties.
风火山隧道是世界上海拔最高的隧道，地质条件和气候条件均极为特殊，隧道的施工难度极大。
Fenghuoshan tunnel is the highest tunnel in the world with unique geological and climatic conditions and great difficulties.
风火山隧道是世界上海拔最高的隧道，地质条件和气候条件均极为特殊，隧道的施工难度极大。
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