excavating shaft

例句：

1. 1. The engineers were excavating a new shaft to connect thetwo tunnels.
   工程师们正在挖掘一个新的井筒，连接两个隧道。
2. 2. The constructioncrew was working on the excavatingshaft when a worker fell and injured himself.
   施工队在挖掘井筒时，一名工人摔伤了自己。
3. 3. Theexcavating shaft wascompleted ahead of schedule, whichsaved the company a significant amount ofmoney.
   挖掘井筒提前完成，为公司节省了一大笔资金。