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  1. Oxford American Dictionary

    reciprocating

    • IPA[rəˈsiprəˌkādiNG]

    美式

    • adj.
      (of a part of a machine) moving backward and forward in a straight line
    • 釋義

    形容詞

    • 1. (of a part of a machine) moving backward and forward in a straight line the reciprocating piston of a traditional internal combustion engine