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1.The air change rate is a crucial factor in determining the indoor air quality.
空气交换率是决定室内空气质量的重要因素。
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2. To improve indoor air quality, it's important to maintain a high air change rate.
为了改善室内空气质量，保持高空气交换率是很重要的。
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3.The hospital has implemented strict measures to ensure that the air change rate meets the required standards.
医院已经采取了严格的措施，以确保空气交换率符合规定的标准。