For those who work on the site, bridging is hard in other ways. 在其它方面，对现场施工人员来说，架桥则是一项很艰苦的工作。
The long-deep tunnels under complex geological conditions always have water-fathering problems which affect the construction safety and course. 摘要复杂条件下的深埋长隧涌突水是常见的主要灾害之一，严重威胁着现场施工安全及进度。
