减径管

例句：

1. 1. The pipeline was designed to reduce pressure in the area.
   该管道设计用来降低该地区的压力。
2. 2. The valve is used to control the flow of gas through the pipe.
   阀门用于控制气体通过管道的流动。
3. 3. The reduction in pressure helps to prevent leaks and improve efficiency.
   压力的减少有助于防止泄漏并提高效率。