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  1. hammer drill

    英式

    • n.
      a power drill that works by delivering a rapid succession of blows, used chiefly for drilling in masonry or rock.
    • noun: hammer drill, plural noun: hammer drills

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    • IPA[ˈhamər ˌdril]

    美式

    • n.
      a power drill that works by delivering a rapid succession of blows, used chiefly for drilling ...

    Oxford American Dictionary