bow drill

名词 n.
中文释义

英文释义

名词 n.
  1. A simple rotational hand-operated tool of prehistoric origin, used as a fire drill for ignition, or for other drilling tasks such as woodwork and dentistry.
    — [I]n the year 1000 the trepanner had at his disposal the semi-mechanical bow drill that was used by carpenters and masons of the time.

词形变化

bow drills plural
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