牙膏是怎么定義的？
牙膏是我們?nèi)粘Ｉ畹那鍧嵱闷?，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(lèi)社會(huì)科技的發(fā)展，牙膏生產(chǎn)設(shè)備與工藝的不斷改進(jìn)與完善，牙膏的形態(tài)、功能…
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