bacterial pollution的用法和样例：
例句
- Nevertheless, the risk of bacterial contamination exists with any sterile equipment that is employed in an operating room setting.
然而，不管在手术室环境内使用什么无菌的设备，细菌污染的风险都是存在的。 - That sample did not match a B. subtilis strain found in Ivins' lab, says Bannan, but the bacterial contamination still could have come from somewhere else in Ivins' institution.
布南说，尽管样本和在埃文斯实验室里面发现的枯草芽孢杆菌不匹配，但是这些细菌污染也有可能来自埃文斯所在的研究机构的其他某些地方。
