free from contamination

基本解釋

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(wú)脫落污染、效率高、不需電能消耗、重量輕、容易清洗、便于維修、應(yīng)用范圍廣泛等特點(diǎn)。
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(xiàn)有的很多物體，尤其是公共使用的物體，表面易粘污、不防涂畫(huà)、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.
外生的表面污染，包括：塵土、油脂、來(lái)自鋼鐵加工的游離鐵等等，可以影響到鈍化膜的生成。
blog.sina.com.cn