Dark text on a light background is best but avoid white backgrounds.

在亮色背景中使用暗色的内容是最好的，但要避免白色的背景。

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It is very easy to find winter trees with snowy white backgrounds.

在雪白色的背景下，很容易找到冬天的树的图。

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The ratio of reflectance of the coating over black and white backgrounds at equal film thickness.

同涂层遮盖力相关的一个数值，以相同的涂层的厚度在黑色和白色背景下涂层反射系数的比值。

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The iPhone 5 is significantly brighter than the Galaxy S4, particularly for screens with mostly peak white backgrounds.

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Reliable ethnicity data for the whole profession is not available, but 9% of newly qualified teachers were from non-white backgrounds.

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The majority were from "middle class" backgrounds and white.

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