Piston tings

• 活塞环

Piston tings的用法和样例：

例句

1. These bands are called piston rings.
   这些圈叫做活塞环。
2. The unrestrained piston ring curve has been analyzed by the finite element method.
   摘要引入有限元法对活塞环自由状态曲线进行了分析研究。