名词
中文翻译：通风系数
同义词：
['ventilation factor', 'ventilation rate']
例句：
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1.The building has a high ventilation number, which helps to reduce indoor air pollution.
这栋建筑的通风系数很高，有助于减少室内空气污染。
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2. The new air conditioning system has a low ventilation number, which means it will not be very effective in improving indoor air quality.
新的空调系统通风系数低，这意味着它不太可能有效地改善室内空气质量。
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3. The ventilation number is an important factor in determining the effectiveness of a ventilation system.
通风系数是决定通风系统有效性的一个重要因素。