In recent 20years, indoor air quality has became a research focus in the field of building environment due to people's demand on living standard and environment.
随着人们对生活质量和生存环境要求的日益提高，室内空气品质成为近20年来建筑环境领域的一个研究热点。
As the improving of living standard and changing of life style, people spend more and more time inside the room, thus the quality of indoor air directly affects people's work and life.
随着生话水平的提高和生活方式的改变，人们在室内生活的时间越来越长，室内空气质量的优劣直接影响到人们的工作和生活。
With the improvement of the living standard, people pay more attention to indoor air quality.
随着生活水平的提高，人们对室内空气环境质量越来越重视。
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