十万个为什么·科学阅读30篇（3）
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Why Do Fireflies Light Up at Night?
萤火虫为什么在夜晚发光？
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Fireflies make light through a chemical reaction.萤火虫通过化学反应发光。
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Two chemicals mix inside their bodies to create cold light.两种化学物质在它们体内混合，产生冷光。
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No heat is produced—unlike light bulbs.此过程不产生热量，与电灯不同。
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Each species has its own flash pattern and rhythm.每种萤火虫都有独特的闪光模式和节奏。
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Males flash to find mates; females answer back.雄虫闪烁以寻找配偶，雌虫回应。
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Light helps them avoid predators too.发光也有助于它们躲避天敌。
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They glow more on warm, humid summer nights.温暖潮湿的夏夜，它们发光更明显。
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Scientists copy this chemistry for medical tools.科学家模仿这种化学原理开发医疗工具。