安装在环槽中的活塞环有两种类型：压缩环和机油环。
The piston rings carried in the ring groove are of two basic types: compression rings and oil-control ring.
上部的活塞环用来阻止压缩空气泄露；而下部的活塞环用来控制气缸壁上存留下来的机油数量。
The upper ring or rings are to prevent compression leakage; the lower ring or rings control the amount of oil being deposited on the cylinder wall.
窜气，基本上是被压缩的空燃混合气和燃烧后的气体的泄漏，它通过活塞环进入曲轴箱。
Blowby is basically the leakage of compressed air-fuel mixture and burned gases past the piston rings into the crankase.
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