pressure seal rings

• 活塞环

pressure seal rings的用法和样例：

例句

1. These bands are called piston rings.
   这些圈叫做活塞环。
2. Contrary to popular belief, piston rings don't seal the combustion pressure by spring tension.
   和人们认为的不同，活塞环不能靠弹簧张力来密封燃烧室的压力。