About 2 million years ago, our feeble and bulnerable (susceptable) ancestors dwelled in the cavities and they were exposed to grim hardships in nature so as to be prone to diseases.
大约二百万年以前，我们虚弱而且易受攻击的祖先居住着山洞里，他们面临大自然的严峻考验，很容易生病。
About 2 million years ago, our feeble and bulnerable (susceptable) ancestors dwelled in the cavities and they were exposed to grim hardships in nature so as to be prone to diseases.
大约二百万年以前，我们虚弱而且易受攻击的祖先居住着山洞里，他们面临大自然的严峻考验，很容易生病。
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