drop hammer

名词 n.
中文释义

英文释义

名词 n.
  1. A heavy weight that is raised and then allowed to drop, as used for piledriving and drop-forging.
    — On embankments these troughs are supported by piles driven into the ground and recent practice has been to drive them in by a drop hammer, manually operated from a railway wagon, [...].

词形变化

drop hammers plural
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