1. Overall speaking, the quality of the ground water in most of the cities and regions in the entire country is very good, with point and non-point pollution in certain regions to certain extent and certain indicators exceeding the standards. The key pollution indicators include mineralization degree, total hardness, nitrate, sub-nitrate, ammonia nitrogen, iron, manganese, chloride, sulfate, fluoride and pH value. 
   全国大部分城市和地区地下水水质总体较好，局部受到一定程度的点状或面状污染，部分指标超标，主要污染指标有矿化度、总硬度、硝酸盐、亚硝酸盐、氨氮、铁、锰、氯化物、硫酸盐、氟化物、ph值等。
2. vinyl chloride pollution and angiosarcoma 
   氯乙烯污染与肝血管肉瘤
3. a mineral consisting of manganese carbonate; a source of manganese. 
   一种含有碳酸锰的矿物，是锰的来源。
4. a mineral consisting of manganese tetroxide; a source of manganese. 
   一种由四氧化锰组成的矿物，是锰的来源。
5. a mineral consisting of manganese dioxide; an important source of manganese. 
   一种含有二氧化锰的矿物，是锰的重要来源。

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• 1. 氯化锰
  manganese bronze 锰青铜...manganese chloride 氯化锰...manganese dioxide 二氧化锰
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• 2. 氯化锰〔营养增补剂〕
  manganese　锰〔人体所需微量元素之一〕...manganese chloride　氯化锰〔营养增补剂〕...manganese gluconate　葡糖酸锰〔营养增补剂〕
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