Researchers at the University of Chicago, found through experiments, shrimp and other food soft shell contains a lot of concentration higher - five potassium arsenic compounds.
美国芝加哥大学的研究员，通过实验发现，虾等软壳类食物含有大量浓度较高的-五钾砷化合物。
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With in danger concentration in the environment, arsenic becomes a latent and public problem.
环境中含有危险浓度的砷，成为潜在的公共问题。
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For each child, the researchers measured the concentration of manganese in tap water from their home, as well as iron, copper, lead, zinc, arsenic, magnesium and calcium.