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。
As it travels through various points of the supply chain, there are possibilities of this food being exposed to temperatures or other factors that could lead to its contamination.
由于这些蔬菜水果会经过供应链的各个节点，暴露在常温下或者其它因素会导致污染。
Therefore, the study of condition that crops threatened by lead pollution is vitally significant for the prevention of food contamination and protection of human health.
因此，研究作物铅污染胁迫状况，对于防止食品污染，保障人体健康有着重要的科学意义。
With the progress in time, this disposal site has become a hidden trouble having a potential to cause a major contamination accident, which would lead to the worst social impact.
随着时间的推移，这一“处置场”成了一个可能产生重大污染事故的隐患，造成不良的社会影响。
Port facilities construction and renovation contribute to surface and ground water contamination and air pollution from asbestos, lead-based paint, dust, sediments, PCBs and petroleum hydrocarbons.
港口设施的建设和改造，而造成地下水污染和对空气的污染是来自石棉、含铅的油漆、灰尘、沉淀物、多氯联苯、石油碳氢化合物等。
There are many factors pollute the surface water in Zhejiang province, daily sewage of town, industrial sewage and contamination of rural areas lead to serious water pollution.
浙江省地表水受污染的影响因素多，城镇生活污水和工业废水排放及农村面源污染均造成了较严重的水环境污染。
Over several decades China's industrial boom has caused widespread contamination by heavy metals such as lead and cadmium, resulting in a silent health epidemic that can be difficult to spot.
近几十年来，中国的工业荣华已导致大面积重金属(如铅和镉)净化，形成可能难以察觉的无声的公共卫生危机。
It can lead to treatment fluid reverse flow, which cause formation contamination. After treatment, production declines dramatically, and with long period of production restoration.
作业易造成作业液倒灌污染地层，作业后产量大幅下降，产量恢复周期长。
It can lead to treatment fluid reverse flow, which cause formation contamination. After treatment, production declines dramatically, and with long period of production restoration.
作业易造成作业液倒灌污染地层，作业后产量大幅下降，产量恢复周期长。
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