如此精确的行为暗示着癌细胞是生物长期进化的产物。
Such well-honed behaviour suggests they are the product of a long period of biological evolution.
我们已经可以绘制出长期进化过程中产生的大气中现存的氧气水平的大致步骤。
We have been able to outline the steps in the long drawn out process of producing present-day levels of oxygen in the atmosphere.
有可能和增加我们祖先生存几率有联系的那些恐惧是通过自然选择长期进化而来。
It is possible that those fears associated with increased odds of survival in our ancestors evolved over time by natural selection.
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