Controlling the source (s) of light in your designs (even if just with a linear or radial gradient) can help create atmosphere in your page designs.

控制好光源位置能够为你的页面设计创造独特气氛(即使仅仅是一个简单的线性或径向渐变也能达到效果)。

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Source identification of heavy metals was the precondition of preventing and controlling pollution.

对土壤重金属污染物来源的鉴别是准确、有效控制和治理污染源的前提。

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This paper brings forward the indoor VOCs concentration control means, such as source controlling, ventilation and indoor air purifying based on the trait of VOCs emitting and distributing.

针对影响污染物散发及分布特点，给出了室内挥发性有机化合物的具体控制方法，如源头控制、通风及室内空气净化等。

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