对于随机的变化关键要记住的是，实际的观测资料都在平均数或者中间值周围。
The key thing to remember about random variables is that actual observations are centered around an average, or mean value.
自我意识的发展和个体认同的概念是使我们成为人类的神经生物学变化的关键部分。
The development of self-consciousness and the notion of individual identity were critical parts of the neurobiological changes that made us human.
这预示着科学探索中关键因素发生了变化。
It signals a change in what has, until now, been a key element of scientific endeavor.
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