The results revealed that copper pollution and strong acid were the major problems of this mine land.
研究表明，铜污染和强酸性是该矿山土地的最主要问题。
Further analysis indicated that external copper pollution was the major cause of the crack in the bent pipe.
进一步分析，认为外来铜污染是引起弯管开裂的主要原因。
The fact that copper pollution of laccaic acid in stick lac could not be avoided was concluded after considering its biological source and chemical nature.
从紫胶的生物来源和紫胶红色素的化学本质分析，紫胶原胶中紫胶红色素的铜污染是不可避免的。
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