受压使之具有预张力，活塞环就紧紧地压在气缸壁上。

Compressing the rings give them an initial tension; they press tightly against the cylinder wall.

youdao

受压使之具有预张力，活塞环就紧紧地压在气缸壁上。

Compressing the rings give them an initial tension; they press tightly against the cylinder wall.

youdao