1. Methylmercury is a highly toxic substance that can accumulate in fish and shellfish.
甲基汞是一种高度有毒的物质，可以在鱼类和贝类中积累。
2. Prenatal exposure to methylmercury can have detrimental effects on a child's development.
孕期暴露于甲基汞可以对儿童的发育产生不良影响。