free from contamination 无污染
environmental contamination 环境污染
water contamination 水污染
contamination control 污染控制;污染管制
soil contamination 土壤污染
bacterial contamination 细菌污染
oil contamination 油污
radioactive contamination 放射性污染
microbial contamination 微生污染 food contamination 食品污染
cross contamination 交叉污染;交互粘染
lead contamination 铅污染
source of contamination 污染源
surface contamination 表面污染
mercury contamination 汞污染
particulate contamination 微粒子污染