就在那时，大门口有人敲门。

Just then, someone knocked at the front door.

《牛津词典》

在那时，女人登台演出不被认为是完全适宜的。

In those days it was not thought entirely proper for a woman to be on the stage.

《柯林斯英汉双解大词典》

就在那时，门开了。

At that (very) instant, the door opened.

《牛津词典》

But then who would understand better than John Milton, Sr. the importance or the value of a long-term investment strategy?

但在那时谁又比弥尔顿先生更懂得,长远投资的重要性呢？

耶鲁公开课 - 弥尔顿课程节选

But when I went to public school in ninth grade, that's when I was like, "Wow!"

但是当我上九年级时在公立学校上，那时我就觉得“哇”！

现在的孩子好可怕 - SpeakingMax英语口语达人

But at the time, they didn't have a well-formed name for it, they were just saying OK, there's this fourth quantum number, there's this intrinsic property in the electron.

但在那时，人们没有给它取名，他们只是说ｏｋ，这是第四个量子数，这是电子的本征性质，　

麻省理工公开课 - 化学原理课程节选