美国博尔德科罗拉多大学的研究人员仔细检查了这些来自南非布龙·保斯山洞的石器，它们可追溯到中石器时代，有些甚至可追溯到75,000年前。
Researchers from the University of Colorado at Boulder examined stone tools dating from the Middle stone Age, some 75, 000 years ago, from Blombos Cave in what is now South Africa.
有些创世论者认为神话中的龙其实就是恐龙，它们大约在冰河时代末期与其它生物一同绝迹。
Some creationists believe that dragons of mythology were actually dinosaurs, and that they died out with other creatures around the end of the ice age.
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