The practice of adding the industrial chemical melamine to milk 'has existed for a long time in this industry.
郭浩说，在牛奶中添加三聚氰胺化工原料的做法在业内早已有之。
List of substandard milk powders: People searched for this after learning that many brands of milk powder had been laced with melamine, a toxic industrial chemical.
不合格奶粉名单：了解到多个品牌的奶粉掺加了有毒化工原料三聚氰胺的消息后，人们纷纷上网搜索这一名单。
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