underground pipe

例句：

1. 1. The construction crew had to dig a large underground pipe to connect the two buildings.
   建筑工人不得不挖一条大地下管道来连接两座大楼。
2. 2. The underground pipe was filled with water and sealed for safety reasons.
   这条地下管道被水填满并密封起来，出于安全原因。
3. 3.The underground pipe was leaking, and we needed to fix it immediately.
   地下管道正在泄漏，我们需要立即修理。