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大约在20年前,染发术刚刚在美国兴起时,人们并不知道染发剂对人体是否有伤害。于是,美国国立癌症研究会便用老鼠做试验。试验
About 20 years ago, when hair dyeing was just beginning to emerge in the United States, people did not know whether the hair dye hurt the human body. As a result, the National Cancer Institute will use mice to do the experiment. test