缸盖的下方和活塞顶部形成燃烧室。
The underside forms the combustion chamber with the top of the piston.
简单地讲，活塞环就是装在活塞顶部的凹槽里的薄，圆的金属。
In simplest terms, piston rings are thin, circular pieces of metal that fit into grooves in the tops of the pistons.
共晶铝硅合金活塞顶部直径有两次突然长大，而过共晶铝合金活塞仅有一次。
The crown diameter of eutectic al Si alloy piston has increased suddenly in twice, but the hyper eutectic al Si alloy piston only once.
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