It alleges that 27 Apple suppliers have severe pollution problems, from toxic gases to heavy metal sludge.
报告宣称27家苹果供应商有严重的污染问题，从有毒气体到重金属泥渣。
Heavy metal in excess of the standards is the main factor restricting agricultural use of beer sludge.
重金属超标是限制大量啤酒污泥进行农业利用的主要因素。
Irrigating soil with sludge and sewage is one of main reasons causing soil heavy metal pollution.
施用污泥及污水灌溉是造成土壤重金属污染的重要原因之一。
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