“plughole”的概念、定义、翻译、参考文献-科学参考

单词	plughole
释义	plughole [`plǝg´hōl] ^{MINING ENGINEERING} 1. A passageway left open while an old portion of a mine is sealed off, to help maintain normal ventilation; it is sealed when the work is finished. 2. A hole for an explosive charge or for a bolt.
随便看	mask word masochism masonry masonry cement masonry dam masonry drill masonry nail mason's hydrated lime Mason's theorem mass mass absorption coefficient mass absorption law mass action law massage mass-analyzed ion kinetic energy spectrometry mass attraction vertical mass burning rate mass color mass communication mass concrete mass conversion mass data multiprocessing mass defect mass-distance mass divergence

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