在地下水位线，被河流遗弃的远古洞穴中充斥着石笋和钟乳石。
Above the water table, ancient caverns abandoned by the river slowly fill up with stalactites and stalagmites.
但来自卡尔加里大学的研究人员胡里奥·梅尔卡德不同意上诉结论，他决定通过检测在一处又深又长的远古洞穴中发现的70件石器一探究竟。
But a researcher [Julio Mercader], from the University of Calgary, decided to survey 70 stone tools found in one of the deep chambers of a long cave.
人类作出争斗或逃避的反应使其在远古时代得以在洞穴或丛林中生存。
Without the fight-flight reaction, man would never have survived the cave and the jungle.
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