Industrial exhaust must be well treated. 工業廢氣必須妥善處理。
But as industry and our nation grew, more people and more land were exposed to dirty air emissions from industrial smokestacks and automobile exhaust. 但是隨著工業和我們國家的壯大，越來越多的人和土地暴露於工業廢氣和汽車尾氣造成的空氣污染之中。
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