In a study published in the journal Ambio, scientists found that lead levels in soil in the North-eastern United States had decreased markedly since the introduction of unleaded gasoline.
在《人类环境杂志》上发表的一项研究称，科学家们发现，自引进无铅汽油以来，美国东北部土壤中的铅含量已经显著下降。
The authors of the Ambio study examined samples of the upper layers of soil taken from the same sites of 30 forest floors in New England, New York and Pennsylvania in 1980 and in 1990.
《人类环境杂志》上的研究文章的作者在1980年和1990年分别检测了取自新英格兰。纽约和宾夕法尼亚20个森林土地统一地方的表层土壤样本。
The authors of the Ambio study examined samples of the upper layers of soil taken from the same sites of 30 forest floors in New England, New York and Pennsylvania in 1980 and in 1990.
《人类环境杂志》上的研究文章的作者在1980年和1990年分别检测了取自新英格兰。纽约和宾夕法尼亚20个森林土地统一地方的表层土壤样本。
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