Warning: file_put_contents(): Only 0 of 5122 bytes written, possibly out of free disk space in /www/wwwroot/ppbbu/73904.com/index.php on line 55 bituminous coal dust例句_bituminous coal dust英汉例句_bituminous coal dust双解例句_骑士汉英词典
The paper reported the epidemiological results of 22-year follow-up study of workers exposed to dust at bituminous coal mines. 本文報道了菸煤煤鑛井下工人22年追蹤觀察的職業流行病學調查研究結果。