日常英语场景30篇（4）
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Formaldehyde Test: Air Quality and Ventilation
甲醛检测与通风方案
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I just moved into a new flat with new furniture.
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Can you test the air for formaldehyde?
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How long does the test take to finish?
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The result shows 'safe level' — what does that mean?
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How many hours should I open windows each day?
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Is using an air purifier helpful too?
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Please give me simple tips for better air flow.
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Fresh air helps me sleep well and feel strong.