Some groundwater environmental background values were suggested to be the important reference index of groundwater oil pollution.

提出地下水环境对照值可以作为地下水是否受到油类污染的重要参考指标。

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On discussing the economic life and cultural history of Luoyang in the Eastern Han Dynasty, we should attach an importance to its ecological and environmental background.

我们讨论东汉洛阳地方的经济生活和文化历史时，不应当忽略与此有关的生态环境的背景。

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The results showed that this estimation method highlighted a macroscopic variability regularity of the environmental background value for element calcium of topsoil in China.

结果表明，这种估值方法突出反映了钙元素在中国的宏观变化规律。

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Amelia Janisz, Greenreviews.com: An expert system that does all the sorting through federal, state, and local laws and provides customized, sustainability-centered checklists for managers and engineers with or without an environmental background.

FORBES: A Year Of Startup Work -- In 1 Night?

The background is that several police were sent undercover to look into various environmental movements.

FORBES: Lying to Women About Sex Breaches Human Rights Apparently