Winding through mountains and under highways, a man made tunnel system 44 miles long will pump the water into a reservoir.

穿山越谷，一个44英里长的人造管道系统把水抽到水库里。

youdao

By way of safety system engineering method analyzing, in this paper, the general safety system on the tunnel fire protection and rescue of the long highway tunnel is discussed.

从安全系统工程的角度考虑，本文较全面的论述了长大双洞公路隧道火灾防灾救援安全体系。

youdao