ring-gap restrictor

例句：

1. 1. The ring gap restrictor is usedto prevent the passage of air through thegap between the rings.
   环形间隙限制器用于防止空气通过环之间的间隙。
2. 2. The ringgap restrictor was designed to improve theefficiency of the machine.
   环形间隙限制器被设计用来提高机器的效率。
3. 3. The ring gaprestrictor is a crucial component in theoperation of the engine.
   环形间隙限制器是发动机运行中的关键部件。