Other causes include over exposure to radon, asbestos and air pollution.

其他的病因包括氡，石棉的过度接触和过度暴露于空气污染。

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This text introduced the pollution status of asbestos tailing during asbestos exploitation, and analysed the speciality of asbestos tailing and its advancement of utilization as resource.

本文介绍了石棉矿开采过程中排放的石棉尾矿污染现状，分析了石棉尾矿特点及其资源化利用研究进展。

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For example, in order to prevent secondary pollution, even the use of sewage is not Valve asbestos packing and gasket sealing.

例如为了防止二次污染，即使是排污阀也不采用含石棉的密封填料和垫片。

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