There is much sulphate in environment water in northwest China, where metal sulphate is also wide spreaded.
西北地区的环境水中常含有大量的硫酸盐，金属硫化物也有广泛分布。
A wide stretch of land spreaded in front of us.
我们面前是一片广阔的土地。
Heavy metals are important pollutants and copper is one of them with high toxicity and wide-spreaded.
重金属是一类重要的环境污染物，铜是其中毒性大、分布广的一种。
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