Soil utilization of sewage sludge is an important international method of treating sewage sludge, and how to prevent the pollution of heavy metal is always the most important problem.

污泥土地利用是当今国际上非常重视的污泥处置方式，如何防止重金属的污染一直是污泥农用中最重要的问题。

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Heavy metal has always gone for big and heavy and hairy.

NPR: Kicking and Screaming, Metal Back in Music Spotlight

Heavy metal has not always been viewed with the same sense of awe by fans in South America, according to Cristiane Richardson, a Brazilian who presents the weekly heavy metal radio show Sonic Attack from London.

CNN: Iron Maiden to rock Brazil ... again