When you want to study ancient human and Neanderthal remains, there's a big issue of contamination with contemporary human DNA.

当你想要研究古人类和尼安德特人的遗骸，一个大问题是当代人类的 DNA 受到的污染。

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Long-term storage and improper disposal of this material may result in dioxin release into the environment and the contamination of human and animal food supplies.

长期储存以及不当处置这种材料可能导致二恶英泄漏到环境中，导致人类和动物食物污染。

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The MoD launched Project Cleansweep in 2007 to provide "reassurance" that residual contamination at UK sites did not pose a risk to human health or the environment.

英国国防部于2007年实施了清扫项目，以使公众确信这些地区的残留污染不会对公民健康和环境造成威胁。

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Occidental Petroleum, for example, is involved in a major human rights and environmental contamination lawsuit regarding the pollution of indigenous land and the Amazon River.

FORBES: Magazine Article

"The area is very big, very heavy contamination, lots of human resources are needed, definitely machinery is needed, " he said.

BBC: 'One year' to clean toxic spill in Hungary

Gaza's only fresh source of water is too dangerous to drink because of contamination by fertiliser and human waste, a new report says.

BBC: Gaza water too contaminated to drink, say charities