pilot hole

名词 n.
中文释义

英文释义

名词 n.
  1. A narrow hole drilled or punched into a surface, to facilitate the insertion of a wider screw, nail, drill bit, or other boring tool.
    — During the sinking of the last 150 feet, a pilot-hole was kept in advance, so as to prevent any unforeseen inrush of water.

词形变化

pilot holes plural pilot-hole alternative
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