jacket pipe

例句：

1. 1. The jacket pipe is used to cool the engine oil.
   外套管用于冷却发动机油。
2. 2. The engineer designed a new jacket pipe for the pipeline.
   工程师为管道设计了一种新的外套管。
3. 3. The jacket pipe was installed in the cooling system of the car.
   外套管被安装在汽车的冷却系统中。