工厂有自己的医院、面包店和食品店。并且每样东西都是通过数公里的隧道连接的。
The factory had its own hospital, bakery and food stores. And everything was connected with kilometers of tunnels.
这条双向隧道全长超过5.7公里，是连接拉萨和林芝的400公里长的高速公路的一部分。
The two-way tunnel is over 5.7 km long, which is a part of the 400-km highway connecting Lhasa with Nyingchi.
背景材料：这条33.5英里长的铁路隧道连接北海道与本州岛。
Background: This 33.5-mile-long rail tunnel links the island of Honshu with the island of Hokkaido.
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