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单词
bord-and-pillar
释义
bord-and-pillar
\| ̷ ̷ ̷ ̷| ̷ ̷ ̷ ̷\
adjective
:
of or relating to a system of coal mining in which tunnels are driven in a checkerboard pattern having massive square pillars between them which are gradually cut away as the work proceeds
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更新时间:2025/11/14 12:33:49