In the US, mercury levels in the environment have been increasing at a rate of 1.5% each year since 1970.
在美国，环境中的汞含量不断增加，自1970年以来每年的增长率为1.5%。
However, the company said in a statement that the latest tests on its staff had found nobody with elevated mercury levels.
然而欧司朗公司在一份声明中说对其员工的最新测试没有发现有人的汞含量超标。
Of that group, 63 people had blood mercury levels more than twice the recommended level and 19 showed blood mercury levels four times the level considered safe.
在这一组人中，63人血液中汞含量是建议值的两倍以上，而且有19人血液中汞含量是认可安全值的4倍。
This had similar mercury levels to the phloem.
树皮的汞含量与韧皮部相近。
FDA stopped monitoring mercury levels in domestically-caught fish in 1998. Yet in one sampling, three of the four fish tested in 1997 had levels exceeding FDA's human health standard for mercury.
美国食物药品管理局在1998年已停止监管在本地捕捉鱼类的水银含量。但是在1997年一个抽样调查中，每四尾鱼中有三尾超过食物药品管理局的水银含量健康标准。
Mercury levels are high in marine fish, too—particularly in larger species, such as shark, tuna, and swordfish.
海洋鱼类中的汞含量也很高——尤其在体型较大的鱼类体内，如鲨鱼、金枪鱼和旗鱼。
Mercury levels are high in marine fish, too—particularly in larger species, such as shark, tuna, and swordfish.
海洋鱼类中的汞含量也很高——尤其在体型较大的鱼类体内，如鲨鱼、金枪鱼和旗鱼。
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