灯光一明一暗，间隔相等。
函数是中学数学重要的基础知识，函数部分结构上具有“一明一暗”两条主线。
Function is one of the fundamental and basic knowledge in Middle and High school mathematics and its structure contains two clues, one called "explicit clue" and the other "implicit clue".
双关语是广告创作常用的技巧，它是在特定语言环境中用一种文字形式表达出一明一暗双重意义，既引人注意又能引起联想。
The puns are useful techniques which can express double meanings, both get people's attention and lead them fall into imagination in a certain language situation.
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