其中6个控制皮肤色素和头发的进化，4个促进免疫系统抗击疾病——从而使一些有机体，比如使在某些地方肆虐的疟疾寄生虫在其他地方绝迹。
Six controlled skin pigment and hair development. Four helped the immune system combat disease-causing organisms, such as malarial parasites, that are a problem in some places, but absent from others.
这会致使无害的皮肤寄生细菌进入皮肤内，在那儿它们可能成为危险的暂住细菌。
This allows harmless skin residents to go beneath the skin, where they can become dangerous transients.
如果你过于频繁地擦洗皮肤，特别是用过抗菌香皂，就可能会打乱寄生细菌的平衡，从而导致某种细菌过剩引起皮肤过敏。
If you scrub your skin too frequently, especially with anti-bacterial soap, you could upset resident bacteria, leading to the overpopulation of certain species and local skin infections.
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