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曾经,这几种疾病肆虐全人类,造成数千万人死亡;如今,医学家研制出克制它们的疫苗,有的疾病甚至已经销声匿迹……感恩医学 ...
曾经,这几种疾病肆虐全人类,造成数千万人死亡;如今,医学家研制出克制它们的疫苗,有的疾病甚至已经销声匿迹……感恩医学 ... from www.hereinuk.com
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