pit prop

名词 n.
中文释义

英文释义

名词 n.
  1. A wooden beam used as a support within a mineshaft or tunnel.
    — Whereas Germany at the outbreak of war was the greatest purchaser of Swedish iron ore, Great Britain was by far the greatest buyer of Swedish wood products. German submarines, however, have taken deadly toll of Scandinavian ships laden with pit-props bound for England.

词形变化

pit props plural
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