pillar and stall
Mining
noun
A method of mining in which the working is advanced in a series of stalls; frequently attributive; cf room and pillar.
Origin
Mid 19th century.
| 单词 | pillar and stall |
| 释义 | pillar and stallMining noun A method of mining in which the working is advanced in a series of stalls; frequently attributive; cf room and pillar. Origin |
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