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'Ideal photo voltaic procedure' present in seek for alien existence 科学家在寻找外星生命的过程中发现 “完美太阳系”Dimension issues In relation to extinction threat 动物的体型可能是决定其灭绝的关键因素HIV life expectancy 'close to ordinary' as a result of new drugs 研究发现新药物可使艾滋病毒携