“Once upon a time” is the English equivalent of “原来如此” in the context of storytelling. It’s the beginning of many fairy tales and children’s stories. Here are a few variations of “once upon a time” that could be used in different contexts:

  1. Once upon a time…

  2. Long ago, in a land far, far away…

  3. In the beginning…

  4. There was a time…

  5. Once, in a kingdom by the sea…

Each of these phrases sets the stage for a story to unfold.