an illustration of old factories with smokestacks belching smoke. From a program for the play "When a Girl Loves" from the Library of Congress 工業污染 externalsource、factories、factory、industry、loc、smoke、smokestack 外部源、工廠、廠、行業、地方、抽煙、煙囪 資料來源：openclipart ( https://openclipart.org/ )
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