The 95.3-mile (153.5 km) long Gotthard Base tunnel network now being drilled out beneath the Alps, when finally completed in about ten years, will be the longest underground tunnel ever constructed.
目前正在阿尔卑斯山脚开凿的圣哥达隧道网长95.3英里(153.5公里)，将在10年以后完工，也将是有史以来最长的地下隧道。
The 95.3-mile (153.5 km) long Gotthard Base tunnel network now being drilled out beneath the Alps, when finally completed in about ten years, will be the longest underground tunnel ever constructed.
目前正在阿尔卑斯山脚开凿的圣哥达隧道网长95.3英里(153.5公里)，将在10年以后完工，也将是有史以来最长的地下隧道。
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