排放控制系统按法规要求来降低发动机可能产生的空气污染。
The emission control system is required by law to reduce the air pollution the engine could produce.
该空气净化器电路控制系统的成功研制，必将为室内空气污染控制与空气净化技术作出巨大的贡献。
The successful development of this air-purifier's circuit control system, will make a significant contribution for indoor air pollution control and air purification technology inevitably.
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