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自从1981年被发现以来,艾滋病毒已经夺取了数千万人的性命。而艾滋病毒出现在地球上的历史,恐怕要追溯到几千万年前。科学家最近研究了非洲马达加斯加岛的灰鼠狐猴,发现它们
Since its discovery in 1981, HIV has already claimed the lives of tens of millions of people. The history of HIV on Earth is probably going to be traced back to tens of millions of years ago. Scientists recently studied African squirrel lemurs in Madagascar and found them