Dongfeng coal mine accident occurring in Qitaihe, Heilongjiang Province proved to be a coal powder explosion triggered by a coal gas explosion是什么意思_Dongfeng coal mine accident occurring in Qitaihe, Heilongjiang Province proved to be a coal powder explosion triggered by a coal gas explosion在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句