It is not practical to fit the piston to the cylinder closely enough to prevent blow-by.

实际上，活塞与气缸间再严密也免不了会漏气。

youdao

It is not practical to fit the piston to the cylinder closely enough to prevent blow-by.

实际上，活塞与气缸间再严密也免不了会漏气。

youdao