The chimpanzee and human lineages shared a common ancestor just six million years ago, a short slice of evolutionary time.
黑猩猩与人类在600万年前曾享有一个共同的祖先，在经历短暂的进化后分道扬镳。
Over evolutionary time, they lose unnecessary genes and become streamlined, ultimately leaving them with a tiny fraction of the genes they started out with: only the ones they really need.
在进化的时候，它们失去了不必要的基因，变得精简，最终留下了它们基因原始的一小部分：只有那些它们真正需要的。
We've inherited all of our biology from mammals, we've just added extra things through evolutionary time.
他说：“我们继承了哺乳动物的所有生理特征，并在漫长的进化过程中，添加了一些新的特征元素。”
The fact that the unchanging regions are so conserved over the course of evolutionary time means that they perform vital roles and that the virus cannot let them change without perishing.
事实上那些不变的区域在进化过程中如此保守，意味着它们担任着重要的角色，一旦改变病毒就会死亡。
Using the codes 1 to 6 representing the different time periods in the evolutionary time scale shown in Figure 1, indicate the geologic time period that best corresponds to each description.
用地质年代表(表1)中的不同年代的编号1 -6，来代表每个描述所出现的地质年代。
Using the codes 1 to 6 representing the different time periods in the evolutionary time scale shown in Figure 1, indicate the geologic time period that best corresponds to each description.
用地质年代表(表1)中的不同年代的编号1 -6，来代表每个描述所出现的地质年代。
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