英语词汇“piston ring”是什么意思，“piston ring”的读音、用法及例句翻译-烛光网

词汇	piston ring
释义	piston ringn.（名词） An adjustable split metal ring that fits around a piston and seals the gap between the piston and the cylinder wall.活塞环：一种可调节的金属环，封住活塞与筒壁之间的空隙并环扣住活塞
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