It is crucial to ensure the rapid construction and safety in the branching-out tunnels constructions.

如何确保分岔式隧道的快速施工和安全，是分岔隧道建设的关键。

youdao

It is crucial to ensure the rapid construction and safety in the branching-out tunnels constructions.

如何确保分岔式隧道的快速施工和安全，是分岔隧道建设的关键。

youdao