Conducting postmortem brain tissue studies is a lengthy process because there are few brains available to study, Courchesne said.
Courchesne说，用死亡的脑组织做研究是一个漫长的过程，因为几乎没有可供研究的大脑。
The idea was to use PET scans combined with recently available chemicals that reveal endorphins in the brain, to compare runners’ brains before and after a long run.
研究使用PET扫描仪将跑步者长跑前后的大脑进行对比，扫描仪中有能够用于显示大脑中内啡肽的化学物质。
The extra calories cooking makes available may have allowed the survival of humans with larger bodies and more complex brains, starting almost two million years ago.
食物在烹煮过程中所产生的额外热量可能是200万年前至今，人的体格变的更强壮，头脑变的更发达从而生存下来的原因。
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