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来源：雅诚德英语网
In fact, studies have shown that more than 95 percent of Americans older than 12 still have detectable levels of PCBs in their blood.
事实上，研究表明超过95%的12岁以上的美国人血液中仍然检测出含有多氯联苯。
In fact, studies have shown that more than 95 percent of Americans older than 12 still have detectable levels of PCBs in their blood.
事实上，研究表明超过95%的12岁以上的美国人血液中仍然检测出含有多氯联苯。