A small piece of the tunnel. Manual work. In total, more than 500 of them were produced.

此隧道的一小部分，手工制作。这些手工制作品的数量共计多于500个。

youdao

Research purposes: in order to ascertain geology condition of karst water bursting disaster in the course of tunnel caving and give a technique foundation for the work of tunnel geology prediction.

研究目的：明确岩溶山区深埋隧道施工突水灾害形成的地质条件，给隧道施工地质超前预报工作提供技术基础。

youdao

The difficult excavation is a difficult point in construction of wind-blown sand tunnel, thus, to ensure smooth going of excavation is a stress of excavation work.

风积砂隧道的施工难点是开挖难，如何保证开挖工作的顺利进行就成为开挖工作的重点。

youdao

In spite of round-the-clock work, progress on boring a huge tunnel into the earth was not up to mark.

FORBES: Delhi's Subway Builder

Rescue work is continuing at a major US-owned gold and copper mine in Indonesia after a tunnel collapsed on Tuesday, trapping more than 20 workers.

BBC: Freeport's Grasberg copper mine

And then one day while driving to work from my home in Silver Lake, a neighborhood five miles northwest of downtown, I cut through the Second Street tunnel and there he is, putting on a one-man concert in a location even noisier than the last one.

NPR: The Redemptive Power of Music, and Friendship