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coal gas 名词

coal mine [ˈkəʊlmaın] 名词, coalpit

coal mine
▶ coal miner 名词

单语范例(未经PONS编辑处理)

英语
Foot-warmers containing hot coals were indispensable for comfort during winter months.
en.wikipedia.org
The agglomerating gasifiers have slightly higher temperatures, and are suitable for higher rank coals.
en.wikipedia.org

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