They found that in unventilated spaces levels can build up and, over time, cause health problems such as allergies and asthma.
研究表明,在不透风的空,了,健康,出现过敏、哮喘等症状。
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The unventilated, deafening carpet workshops where labourers were sometimes chained to the looms and locked in at night.
风不良、震耳欲聋的毯车间,工人们有时织布机上,晚上里面。
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