This machine would also be capable of making a glass-linedtunnel of 40 ft. in diameter or more.
这个机器也可以挖掘玻璃衬里的、直径为40英尺或更多的隧道。
2
How to assure the appearance and configuration of concrete linedtunnel is a key point, and also a difficult point for chamber construction.
如何保证隧洞形体和混凝土外观是洞室施工的一个重点，也是一个难点。
3
A small subway train carries me from the Hart Building, where my office is located, through an underground tunnellined with the flags and seals of the fifty states.