准妈妈也对吃鱼有顾虑，担心其汞含量超标。
Pregnant mothers may also be concerned about eating fish because of the mercury content.
工厂对工人验血，辞掉那些血铅含量超标的人。
The factory conducted blood tests and dismissed those whose lead levels were elevated.
公司负责人告诉她牛奶中抗生素含量超标并扣留了800元作为罚款。
She said company officials also told her the milk contained an excessive level of an antibiotic and withheld another 800 yuan as a penalty.
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