looping pipe

例句：

1. 1. The looping pipe is used to carry waste gas from the factory.
   循环管用于将工厂的废气输送出去。
2. 2.The engineer designed a looping pipe that could efficiently remove pollutants from the water.
   工程师设计了一个循环管，可以有效地从水中去除污染物。
3. 3.The looping pipe was installed in the basement to prevent moisture from entering the building.
   在地下室安装了循环管，以防止水分进入建筑物。