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On these pistons the number piston rings was reduced to three, two compression and one oil-control.

在这些活塞中，活塞环的数量减少到三个，即两个气环，一个油环。

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The piston rings carried in the ring groove are of two basic types: compression rings and oil-control ring.

安装在环槽中的活塞环有两种类型：压缩环和机油环。

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