Research purposes: it is the first time for China to construct tunnel in karst strata with shield method.

研究目的：岩溶地层中采用盾构法施工在国内尚属首次。

youdao

Research purposes: it is the first time for China to construct tunnel in karst strata with shield method.

研究目的：岩溶地层中采用盾构法施工在国内尚属首次。

youdao