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出典:Wiktionary
coal dust (uncountable)
coal + dust
coaldust (usually uncountable, 複数形 coaldusts)
出典:Wikipedia
出典:『Wikipedia』 (2011/02/07 13:12 UTC 版)
Coal dust is a fine powdered form of coal, which is created by the crushing, grinding, or pulverizing of coal. Because of the brittle nature of coal, coal dust can be created during mining, transportation, or by mechanically handling coal.
coal-dust