If the venue of your presentation is not adequately light-proof, select a dark-colored background and use any light color for text.

如果演示的地点不具备足够的防光性，请选择深色背景，并为文本使用任何浅色。

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To make sure that the cameras are accurately recording small changes in reflected light, engineers look for a bright light against a dark background to provide a reference point.

为了确保相机准确地记录来自反射光的细微变化，工程师寻找暗背景上的亮光，来提供一个参照点。

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And the prime evidence for dark energy doesn't come from the cosmic microwave background, either.

而暗能量的首要证据也并非来自宇宙微波背景。

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For more background, see my 2008 magazine article about these practices, Dark Journalism.

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