once upon a time 以前，从前，那时候;从前，很久以前（用于儿童故事的开头）

【例句】
Once upon a time, asking a woman if she has a job was quite a straightforward question.
从前，问一位女性是否有工作是个相当简单直接的问题。

Once upon a time, there lived an old man who had two beautiful daughters.
从前，有一个老人，他有两个美丽的女儿。