研究主要表明，人在40多岁或50多岁时可能会有个停滞时期，或转变阶段，但是这种转变“会让人感到兴奋而非恐惧”。

The bulk of the research shows that there may be a pause, or a shifting of gears in the 40s or 50s, but this shift "can be exciting, rather than terrifying".

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这代表着一个转变阶段。

It represents a transition phase.

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童年期向青春期的转变阶段是发育的关键时期，生理、认知及社交等方面随之发生许多变化。

The transition into puberty is a critical developmental period, associated with many biological, cognitive and social changes.

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Then the Phase Three that I mentioned, the 10,000 years ago had several things occur that were very important in shaping our current situation.

最后是我提过的第三阶段,一万年前发生的某些转变,对塑造当下的饮食结构而言,意义重大

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选