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27. 习作表达。
科学家的很多发明都源自生活中的奇思妙想，你有过什么样的奇妙想法？想发明什么样的神奇物品？请围绕这一主题写一篇习作。
要求：①在现实的基础上合理想象；②把这种物品的样子、构造、功能等特点介绍清楚；③字体端正，标点正确，不少于400字。
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