但有一次，我想象着海蒂来看我。

But once I imagined Heidi visiting me.

youdao

但有一次，电脑突然下降。

But once, the computer was down suddenly.

youdao

但有一次，由于魔法师的协助，时间停止而白昼持续。

But once, with a magician's help, Time was stopped and Day stood still.

youdao

But Eudora Welty was once asked why Southerners can be such great writers, or such good storytellers and she was a wonderful storyteller.

但有一次她被问到,为什么南方总是出伟大的作家,或者是杰出的小说家,她自己就是个很出色的小说家

耶鲁公开课 - 美国内战与重建课程节选

I've passed through Grand Central Station when filming was happening. I don't know what they were filming though.

有一次我从那儿经过，正好有部电影在拍。但我不知道他们在拍什么电影。

电影里的中央车站 - SpeakingMax英语口语达人

Because, as I said, you can only drive one car at a time and if you've got ten of them in the garage, then it doesn't really do you much good.

正如我说的,你只能一次开一辆车,但如果你的车库里有十辆,它实际上并不会给你带来更多的好处

耶鲁公开课 - 金融市场课程节选