他们认识到睡眠分为五个阶段。

They have learned that there are five stages of sleep.

youdao

此解决方案路线图中的五个阶段

The five phases of this solution roadmap

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路线图中的五个阶段：从概念到部署。

The five phases in the roadmap: From concept to deployment.

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So, Freud believed there were five stages of personality development, and each is associated with a particular erogenous zone.

弗洛伊德认为人格发展,分为五个阶段，且每个阶段都与特定的动欲区有关。

耶鲁公开课 - 心理学导论课程节选