但是当某一地区的人口由稀疏和稠密转化的时候，头盖骨的尺寸会减小。

But when a certain area's population changed from sparse to dense, our cranium size decreased.

youdao

他们发现，在老年痴呆症的人群中，有大头盖骨的病人往往比小头盖骨病人有更好的记忆力和思考能力。

They found that people with Alzheimer's with the largest craniums had better memory and thinking skills than patients with smaller skulls.

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一些具有差异化的表现形式但对功能影响不大的特征- - -比如头盖骨的形状，在进化过程中可能起着比自然选择更重要的作用。

With features that can vary somewhat in form without greatly affecting function, such as the shape of the skull, chance might play a bigger role in their evolution than natural selection.

youdao

So, you would expect that when you rip open the skull and look at the brain; you'd see something glorious, you'd see, I don't know a big, shiny thing with glass tubes and blinding lights and sparks and wonderful colors.

所以你会期待,当你打开头盖骨时,当你看到大脑的时候,你会看到些非常辉煌的东西,你会看见,我不知道,附有玻璃管的大块发光的东西,发出耀眼的光芒,不停地冒着火花,拥有美妙的颜色

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