来自《耶鲁大学开放课程：环境政治与法律 第1集 第1集》
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the decline of a variety of commercial fish.许多商业鱼类的数目在下降 -
We'll also be taking a look at the tendency还会看到大型捕食性鱼类 -
of large predatory fish to absorb mercury.吸收汞元素的趋势 -
So mercury is emitted from power plants.汞元素从发电厂释放出来 -
It's also emitted from incinerators.还有焚化炉 -
It goes into global circulation just like DDT would.然后进入全球循环 就像DDT一样 -
It also rains down on the earth它可以被雨水带到地上 -
and it bio-accumulates in large predatory fish.然后在大型捕食性鱼类的身体里聚集 -
By the end of the term, you'll understand学期末的时候 你们就会明白 -
which fish are safe and which are not, and why.哪些鱼安全 哪些鱼不安全 为什么 -
And you'll also question the Bush administration's decision你们也会质疑布什政府 -
to lighten the regulation on mercury emissions为什么要放松对汞元素排放的规定