无污染的;
Also, be sure all insulators are kept clean and free of contamination.
而且, 还要确保所有的绝缘体清洁、不受污染.
来源:网络文摘精选Then, most important of all, the water must be made free from contamination from sewage.
而最重要的是必须使水免于污水的污染.
来源:互联网摘选Fluid only contacts the tubing, helping ensure contamination-free pumping.
流速仅受管道限制, 可确保泵不会受到污染.
来源:互联网摘选Pharmaceutical grade fish oil capsules are also available that are virtually contamination free.
确实做到无污染的药品级鱼油胶囊也可行.
来源:互联网摘选
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