empty tunnel

例句：

1. 1. The tunnel was so dark thatit felt like an empty void.
   这个隧道太黑了，感觉像是一片空无。
2. 2. The engineers were trying to figureout how to fill the empty tunnel.
   工程师们正在试图弄清楚如何填满这个空隧道。
3. 3. The tunnel was filled with the soundof rushing water as they worked theirway through the empty space.
   当他们穿过这个空隧道时，可以听到水声的轰鸣。