翻译一段汉语成英语：“重金属污染指由重金属或其化合物造成的环境污染。主要由采矿、废气排放、污水灌溉和使用重金属制品等人为因素所致。重金属污染与其他有机化合物的污染不同。不少有机化合物可以通过自然界本身

翻译一段话成英语：”重金属污染指由重金属或其化合物造成的环境污染。主要由采矿、废气排放、污水灌溉和使用重金属制品等人为因素所致。重金属污染与其他有机化合物的污染不同。不少有机化合物可以通过自然界本身物理的、化学的或生物的净化，使有害性降低或解除。而重金属具有富集性，很难在环境中降解。” 谢谢！

The heavy metal pollution means that the environment pollution that was caused by heavy metals and their combines, It mainly cause by anthropic factors such as mining ,exhaust emission sewage irrgation and using heavy metals. The heavy is different from other organic compound pollutions,because many organic compounds are able to make nocuit reduce and eliminate by physical chemical, and biological purifications.but heavy metals are hard to be degraded in environment because of enrichment

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