Coal ash is known to contain dangerous elements including arsenic, lead, and selenium, yet the TVA refused at first to issue any health warnings about contamination from the spill.

煤灰渣含有多种危险物质，包括砷、铅、硒等，然而田纳西流域管理局起先矢口否认煤灰渣中含有对健康有害的物质。

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The presence of exogenous surface contamination, including dirt, grease, free iron from contact with steel tooling, and so forth, may interfere with the formation of the passive film.

外生的表面污染，包括：尘土、油脂、来自钢铁加工的游离铁等等，可以影响到钝化膜的生成。

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This paper briefly introduces chemical filters in air-conditioning, including the knowledge of chemical filtration, indices of chemical contamination, inspecting methods and typeable chemical filters.

本文介绍应用于系统的化学过滤器，包括化学过滤一般知识，控制室内环境化学污染的相关指标，现场检测方法和典型过滤器产品。

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But several other possibilities are being explored, including contamination or defect during manufacturing, flaws in the design or construction of the battery, and problems with battery charging.

CNN: Boeing can conduct Dreamliner test flights

President Obama and the White House Council on Environmental Quality are committed to clean water, and want to reduce contaminants in drinking water, including contamination from improperly disposed medications.

WHITEHOUSE: Protecting Our Environment and Our Health: Earth Day + National Take-Back Day | The White House

It said several thousand people had died in accidents in ship-breaking yards over the past 20 years - not including deaths from long-term contamination.

BBC: NEWS | Europe | Asbestos ship 'can sail to India'