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血液为什么是红色的？萤火虫为什么会发光？泪水为什么会是咸的？......从日常生活、自然现象、科学探索、天文地理、人体奇趣、科技发明、古代文明等多方面给予全面的科学解答，十万个为什么，探索未知，打开通向知识世界的大门。
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