A solid cylinder or disk that fits snugly into a larger cylinder and moves under fluid pressure,as in a reciprocating engine,or displaces or compresses fluids,as in pumps and compressors.

 
  • 活塞一种可装到更大的筒里且在液压下移动的固体小筒或碟子,如在往复式发动机中,也可用于更换或压缩液体,如在水泵和压缩机上
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