The air filter element should be replaced after cleaning 3 times, and the cleaning cycle can be determined by the air quality of the usual control area.
空气滤芯通常在清洁3次后就应替换新的，清洁周期能够由平时驾驭区域的空气质量而定。
Detail analysis indicates that the mass cycle modal can improve the efficiency of mass transfer and mass exchange, and can be used in such regions as the control of indoor air quality and etc.
分析表明，质循环模型能够提高质传递和质交换的效率及可控性，可用于室内空气品质的控制等领域。
Whether we choose to go by car, public transport, walk or cycle has a direct impact on the quality of the air we breathe, our health and that of the planet.
无论我们选择开车、乘坐公共交通工具、步行还是骑自行车，都会直接影响我们呼吸的空气的质量、人类的健康和地球的环境质量。
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