How many kilometers is the world's longest and deepest railway tunnel?

世界上最长最深的铁路隧道是多少公里？

Question 3. How many kilometers is the world's longest and deepest railway tunnel?

世界上最长、最深的列车隧道长多少千米？

Switzerland has opened the world's longest and deepest railway tunnel, 17 years after starting work on the project.

经过十七年的漫长工期之后，瑞士终于开通了世界上最长、最深的火车隧道。

Offshore drilling has been completed in Zhejiang Province for the construction of China's first undersea high-speed railway tunnel.

中国首条海底高铁隧道在浙江省完成了海上钻探工作。

Beyond that at 240 meters, you can ride through the deepest railway tunnel in the world that connects the Japanese islands of Honshu and Hokkaido.

继续深入至240米，你可以穿过世界上最深的铁路隧道——连接日本本州岛和北海道。