Many have assumed that humans ceased to evolve in the distant past, perhaps when people first learned to protect themselves against cold, famine and other harsh agents of natural selection.

很多人认为，在遥远的过去，人类通过了饥饿、寒冷等自然选择的严峻考验后，便不再进化了。

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So, before venturing outdoors in Yakutsk for the first time, I have decided to don a suitcase's worth of clothes to protect me against the cold.

所以，在雅库茨克初次出门探险之前，我决定穿上整箱的衣服以御寒。

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In the past, researchers have measured specific compounds made by the body that may protect against a cold or may be triggered by a cold virus.

在过去，研究者们已经测量过一些机体在可能对抗感冒过程中或由感冒病毒诱发产生的特殊的复合物。

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