main valve ring

例句：

1. 1. The main valvering is essential for maintaining the proper flowof gases through the engine.
   主阀环对于保持发动机中气体的适当流动至关重要。
2. 2. Main valve rings are designed to preventleaks and ensure a smooth operation ofthe engine.
   主阀环的设计旨在防止泄漏并确保发动机的顺畅运行。
3. 3. During maintenance, it's important to replace themain valve ring if it shows signs ofwear or damage.
   在维护过程中，如果主阀环出现磨损或损坏的迹象，更换它是很重要的。