People in prehistoric times created paints by grinding materials such as plants and clay into power and then adding water 史前的人们制造颜料是将植物和泥土等原料磨成粉末，然后加水。
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People in prehistoric times created paints by grinding materials such as plants and clays into power and then adding water 史前的人们制造颜料是将植物和泥土等原料磨成粉末，然后加水。
