When did I begin to exist on the personality theory?

根据人格理论，我是什么时候开始存在的呢？

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Once they enter school, children begin to define subjects and erect boundaries that needn't otherwise exist.

一旦他们进入学校，孩子们就开始定义学科，并设立不必要的界限。

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When American kids get into their teens, they begin to find out that Santa Claus doesn't really exist.

当美国小孩子进入十几岁以后，他们开始得知圣诞老人并不是真正地存在。

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When did I begin to exist on the personality theory?

根据人格理论，我是什么时候开始存在的呢？

耶鲁公开课 - 死亡课程节选

If your cost accounting system is not up to snuff, or does not exist at all, where do you begin?

FORBES: Businesses Lose Money From Bad Accounting