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[VOA慢速英语视频 ] VOA慢速英语视频(视频+中英文本) 第155期:科学家计划在物种灭绝前冻结DNA
地球正在经历第六次生物大灭绝。上一次发生在6600万年前,当时一块小行星--一块巨大的太空岩石撞击了我们的星球。2015-08-18 编辑:max
Severity: Notice
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Filename: libraries/Cache_file.php
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Severity: Warning
Message: Memcache::connect(): Can't connect to 127.0.0.1:11211, Connection refused (111)
Filename: libraries/Cache_file.php
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2015-08-18 编辑:max