现在，肤色通过新的人群融合而进化，不同种族的人聚集在一起，于是后代拥有新的肤色基因混合。
Today, skin color is evolving via new mixtures of people coming together and having children with new mixtures of skin color genes.
少数情况下，动物冠状病毒会进化并在人群中传播，如中东呼吸综合征和严重急性呼吸综合征（SARS）。
Rarely, animal corona-viruses can evolve and then spread among people, such as Middle East respiratory syndrome and severe acute respiratory syndrome (SARS).
而那种变异基因没有被生物进化所淘汰，仍然存在于人群之中，其原因在于它也有益处——它能保护人体抵御疟疾的侵袭。
It remains in populations because the mutation has a flip side—it helps to protect against malaria.
这种观点的批评者怀疑是像营养不足，拥挤的森林住所等环境因素导致了矮人群体的进化。
Critics of this argument suspect that environmental challenges, such as nutritional deficiencies or cramped forest quarters, prompted the evolution of short-statured populations.
而在其他的一些情况中，地名则显示了一门语言—尤其是英语—是在不断进化的，它们迷人地一转身，以另一种形式在人群中广泛地传播着。
In other cases, the names offer insights into how language - especially English - is an endlessly evolving thing that takes fascinating twists and turns through popular use.
传统婚姻普遍被视为习俗，现在它已经进化为受教育人群和具有经济实力的人群所享有的奢侈品。
Traditional marriage has evolved from a near-universal rite to a luxury for the educated and affluent.
他们都绝对是特殊的灵魂，比你们更加的进化，甚至在当前地球上的普通人群中就可以找到。
These are indeed special souls, who have evolved much further than you would normally expect to find in the average person on Earth at present.
心理学家称几百万年的人类进化使大脑没有适应生活在成千上万的人群中。
Psychologists have argued that millions of years of evolution means the human brain has not developed to cope with life surrounded by thousands of strangers.
Shackelton进一步解释到：如果病毒和人群的协同进化如同以前所认为的那么严格，我们不会发现病毒和人类的家系图会有如此多的差别。
Shackelton added that if the co-evolution of the virus and human populations were as strict as previously thought one would not find so many differences in the family trees of the virus and humans.
Shackelton进一步解释到：如果病毒和人群的协同进化如同以前所认为的那么严格，我们不会发现病毒和人类的家系图会有如此多的差别。
Shackelton added that if the co-evolution of the virus and human populations were as strict as previously thought one would not find so many differences in the family trees of the virus and humans.
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