mercury accumulation

例句：

1. 1. The accumulation of mercury inthe environment has been a concern for manyyears.
   多年来，环境中汞的积累一直是一个令人担忧的问题。
2. 2. Mercury accumulation in soilcan have serious ecological effects.
   土壤中的汞积累会对生态产生严重的影响。
3. 3. The accumulation ofmercury in fish is a causefor concern as it can be harmful tohumans.
   鱼体内汞的积累引起了人们的担忧，因为它对人类是有害的。