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城大系統工程及工程管理學系講師許冠山博士研發的空氣淨化技術，可將污染物變為無害物質。
Representing Hong Kong in the 37th WorldSkills Competition held 19-22 June in Switzerland, CityU BEng (Hons) graduate, Mr Steward Yeung achieved the status of "Excellent," following quickly on the heels of becoming Champion in the Hong Kong Youth Skill Competition organized by the Vocational Training Council (VTC) in 2002.