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.
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.
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.
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。
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