At this point in the thought experiment, I would like to lay out some definitions.

思维实验这段，我将列出一些定义。

As the authors note, the third stage involves individuals redefining their role in the community.

作者指出，人生的第三段涉及人重新定义自会中的角色。

We can see how whether it's the same person or not has to turn on the relations between the stages.

我们发现要定义两人究竟是是同一人要参考两人所处的段之间的关系。

And each stage, from infancy to old age, is defined by its own predominant issue or crisis.

从婴儿期到老年的段都由其自身的主要问题或危机来定义。

But A.I. is still in its infancy and while computers can now make more decisions than ever before, it's the people who define the impacts they have.

但是，人工智能仍然处于初级段，虽然计算机现可以做出比以往任何时候都多的决定，但是它的影响是由人来定义的。

A dream can be defined as a series of thoughts, images, ideas, emotions and sensations that occur in your mind during various phases of sleep.

梦可以定义为睡眠的同段出现您脑海中的一系列想法、图像、想法、情绪和感觉。

To sum up briefly, today we've discussed the definition of learning, the two stages involved in the process of learning and the four types of learning.

总而言之，今天我们讨论了学习的定义，学习过程中的两段和四种类型的学习。