material needle valve

例句：

1. 1. The engineer useda material needle valve to control the flowof oil.
   工程师使用一个材料针阀来控制油的流动。
2. 2. The newvalve is designed to improvethe efficiency of the system.
   这个新阀门的设计目的是为了提高系统的效率。
3. 3. Thematerial needle valve was installed in the pipelineto prevent leaks.
   在管道中安装了材料针阀以防止泄漏。