un. 活塞环
[网络] 柱塞环；活塞环组合；油环

piston rings的用法和样例：

例句

These bands are called piston rings.这些圈叫做活塞环。
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。

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