selenium contamination

例句：

1. 1. The soilwas heavily contaminated with heavy metals from the mining operation.
   土壤因采矿活动而严重受到重金属污染。
2. 2.The company has been accused of contaminating the water supply with toxic chemicals.
   该公司被指控使用有毒化学物质污染供水系统。
3. 3.The government is investigating the cause of the recent outbreak of food poisoning linked to the contaminated water supply.
   政府正在调查近期与受污染的供水系统有关的食品安全事件的原因。