选择性压力（selective pressure）
许多味觉和嗅觉基因显示出选择性压力的迹象，也许反应了当人们的生活从流动到稳定时食物上发生的变化。
Many genes for taste and smell show signs of selective pressure, perhaps reflecting the change in foodstuffs as people moved from nomadic to sedentary existence.
结论：抗菌药的用药频度，即抗菌药应用的选择性压力，是影响细菌耐药性变异最主要的因素之一。
Conclusion; the DDDs, that is the selective pressure of the antibacterial usage, is one of the main influencing factors of the variation of drug resistance.
此外，由于人类意识思维的进化，对产生发育更多的婴儿有较少的选择性压力，因为增加的能力可以保护人类婴儿。
Furthermore, since the evolution of conscious thought in humans, there is less selective pressure to have more developed infants at birth because of the increased ability to protect human infants.
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