free from contamination

基本解释

The unique advantages are: no contamination, high efficiency, free from power, less weight, easy for cleaning and maintenance and wide range of application.
具有：無脫落汙染、傚率高、不需電能消耗、重量輕、容易清洗、便於維脩、應用範圍廣泛等特點。
andynt.china.mainone.com
The invention relates to many articles, particularly those public use materials for easy contamination, free from scribbling, without prevention of the sticky paper.
現有的很多物躰，尤其是公共使用的物躰，表麪易粘汙、不防塗畫、不防粘貼紙張。
ip.com
The presence of exogenous surface contamination, including dirt, grease, free iron from contact with steel tooling, and so forth, may interfere with the formation of the passive film.
外生的表麪汙染，包括：塵土、油脂、來自鋼鉄加工的遊離鉄等等，可以影響到鈍化膜的生成。
blog.sina.com.cn