Heating, ventilation and air Conditioning in buildings represent a substantial energy demands and insufficient ventilation may result in poor indoor air quality and health problems.
加热、通风和空气在建筑物中意味着持续的能源需求，并且通风不足导致是内空气质量不好和健康受损。
Heating, ventilation and air Conditioning in buildings represent a substantial energy demands and insufficient ventilation may result in poor indoor air quality and health problems.
加热、通风和空气在建筑物中意味着持续的能源需求，并且通风不足导致是内空气质量不好和健康受损。
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