In cylinder swirl is mainly formed by the strong air flow near the cylinder wall.

四气门柴油机缸内涡流主要由气缸周边处的强气流产生；

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It is equipped with piston rings to provide a good seal between the cylinder wall and piston.

上面装有活塞环，从而使活塞和气缸壁之间具有良好的密封性。

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It passes over the top of the ring, and gets behind it to force it outward against the cylinder wall.

高压气体流过密封环顶端并进入其后面，施加向外的压力到缸筒壁上。

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