orifice restrictor

例句：

1. 1. The orifice restrictor is usedto prevent the flow of gasesthrough small openings.
   孔口限制器用于防止气体通过小开口流动。
2. 2. The orifice restrictor was designed to improvethe efficiency of the system.
   孔口限制器被设计来提高系统的效率。
3. 3. The orifice restrictor was installed in thepipeline to prevent leaks.
   孔口限制器被安装在管道中以防止泄漏。