and other indigenous methods
In the past, our method of dealing with discarded circuit boards are mostly open-air burning, acid “wash gold” and other indigenous methods, although the extract from the metal, may be emissions from waste will be on the atmosphere, soil, water, causing secondary pollution.
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and other indigenous methods
以及其他本土方法
以上为机器翻译结果，长、整句建议使用 人工翻译 。