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1 P
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2 pillar
1) столб; предохранительный целик; опорная колонна; стойка•
- arch pillar
- barrier pillar
- bottom pillar
- cap pillar
- crane pillar
- crown pillar
- coal pillar
- draw the pillars
- draw back the pillars
- drift pillar
- end pillar
- entry pillar
- recoverable pillar
- retain a pillar
- safety pillar
- shaft pillar
- split a pillar