Thus, piston rings must be used to provide the necessary seal.
所以活塞环就用来提供必要的密封。
Nowadays, the piston ring seal is really what the break in process is all about.
如今，磨合就是在磨合活塞密封环。
The seal head adopts a conic piston or a ball to meet the need.
根据需要，密封头采用锥形活塞或球体。
The seal head adopts a conic piston or a ball to meet the need.
根据需要，密封头采用锥形活塞或球体。
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