牙膏是怎么定義的？
牙膏是我們日常生活的清潔用品，使用牙膏的歷史可以追溯到2000-2500年前有古埃及，由此，我們知道牙膏的歷史是非常悠久的。隨著人類社會科技的發展，牙膏生產設備與工藝的不斷改進與完善，牙膏的形態、功能…
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