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。
The excretion of methyl mercury becomes very difficult because of high enterohepatic circulation and reabsorption by proximal convoluted tubule.
这也解释了为什么时间久了这些填充物就显得暗淡无光，而这种化合物是无法被人体吸收的，也就意味着它不会像汞元素那样对人体造成损害。
Which explains why fillings dull with age. And the compound isn't absorbed by the body, which means it can't affect the body the way elemental mercury can.
研究发现，采自全国291条河流的鱼样中，都含有一种易被人体吸收的汞——甲基汞。
It found traces of methylmercury, a form of mercury that is readily absorbed, in every fish sampled in 291 streams across the country.
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