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
间里，时间长了，会影响健康，出现过敏、哮喘等症状。
,
气不流畅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，在不透间里，时间长了，会影响健康，出现过敏、哮喘等症状。
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