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单词 piston ring
释义

WordReference Random House Unabridged Dictionary of American English © 2024
piston ring′, 
  1. Automotive, Mechanical Engineeringa metallic ring, usually one of a series, and split so as to be expansible, placed around a piston in order to maintain a tight fit, as inside the cylinder of an engine. Also called packing ring, ring. 
  • 1865–70

Collins Concise English Dictionary © HarperCollins Publishers::
piston ring n
  1. a split ring, usually made of cast iron, that fits into a groove on the rim of a piston to provide a spring-loaded seal against the cylinder wall
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