我们很容易生病。
太疲倦的时候肯定会削弱我们的防御系统，使我们很容易生病。
Getting too tired all the time may definitely weaken our defense system, making us get sick easily.
太累了，所有的时间可能会削弱我们的防御系统，使我们很容易生病。
Getting too tired all the time may definitely weaken our defense system, making us get sick easily.
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。
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.
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