Sewage and waste disposal is properly plumbed from the facility and does not provide a potential source of contamination to contact surfaces, products, components, water supplies, etc.

污水与废弃物通过工厂管道正确排放，不能成为接触面，产品，原料与供应水的潜在污染源。

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On the one hand, living bacteria or parts of the biofilm compound keep on detaching again and again and thus present a microbiological source of contamination for other parts of the system.

一方面，活菌或生物膜化合物的一部分保持反复依附，因而成为系统中其它部分污染的微生物来源。

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Investigations traced the source of all Ebola Reston outbreaks to one export facility near Manila in the Philippines, but the mode of contamination of this facility was not determined.

调查追踪到所有埃博拉·莱斯顿亚型的暴发都源于菲律宾马尼拉附近的一个出口设施，但未能确定这一设施的污染方式。

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He said investigators were working under the "thesis" that the Daschle letter was the source of contamination among the postal workers.

CNN: Postal workers angry over response

In any event, the presence of mouse DNA in these cells must be considered as the source of contamination reported in this experiment.

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Although ice can become contaminated, researchers ruled it out as the source of contamination after testing revealed that it did not contain coliform bacteria.

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