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  1. Oxford Dictionary

    double-acting

    • adj.
      (of a device or product) combining two different functions；(of an engine) having pistons pushed from both sides alternately.
    • 釋義

    形容詞

    • 1. (of a device or product) combining two different functions it is double-acting: it guards your radiator against freeze-ups and helps prevent rust
    • 2. (of an engine) having pistons pushed from both sides alternately.