The excretion of methyl mercury becomes very difficult because of high enterohepatic circulation and reabsorption by proximal convoluted tubule.

由于甲基汞在体内的肠肝循环和肾脏近曲小管对甲基汞的重吸收效率高，使甲基汞的体外排泄十分困难。

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Thiomersal does not contain methyl mercury, which is a naturally-occurring compound and whose toxic effects on humans have been well studied.

硫柳汞不含有甲基汞，后者是一种自然产生的化合物，其对人类的有毒影响已得到充分的研究。

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Thiomersal, however, contains ethyl mercury, not methyl mercury, and ethyl and methyl mercury are quite different.

然而，硫柳汞中所含的是乙基汞，而非甲基汞，乙基汞和甲基汞有很大区别。

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Generally, the health benefits of seafood outweigh the risks associated with methyl mercury, a heavy metal found in varying amounts in much seafood, according to U.S. Department of Agriculture guidelines.

WSJ: Guidelines for Eating Sustainable Seafood

And the finding is particularly pertinent because existing dietary advice to pregnant women, at least in America, is that they should limit their consumption of seafood in order to avoid exposing their fetuses to trace amounts of brain-damaging methyl mercury.

ECONOMIST: Diet and the unborn child