full-face tunnelling

• 全面开挖

full-face tunnelling的用法和样例：

例句

1. In many projects, like the Simplon, for example, a small pilot tunnel is driven before the full diameter of the tunnel is excavated.
   在许多隧道工程中，经如辛普龙大隧道，都要在隧道全面开挖前打一个导洞。