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艾滋病自1981年被发现以来,已经夺去了2500多万人的生命。以前科学家们普遍认为,类似艾滋病病毒的病毒最早可能出现在100万年前。最近,一份新的研究报告否定了这一观点。
Since its discovery in 1981, AIDS has claimed more than 25 million lives. Previously scientists generally agreed that the AIDS virus may first appear in a million years ago. Recently, a new study rejected this view.