他们认识到睡眠分为五个阶段。

They have learned that there are five stages of sleep.

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工程的进行分为五个阶段，介绍了每个阶段的关键工作。

The building works is divided into five stages, each stage set out the key to the work.

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认为迟滞效应是循环载荷之间交互作用的结果，并提出了迟滞过程可以分为五个阶段的看法。

The retardation behavior can be considered as the results of interaction effects between overload and cyclic loads. It is suggested tha retardation process may be divided into five stages.

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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。

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