我们从前碰到过一次。

We met once long ago.

youdao

几年前，我当州长时遇到过一次类似的情形。

Several years earlier, I had faced a similar situation as governor.

youdao

朱海洋只在朋友面前提到过一次杨欣。

This was the only time the friend had heard Zhu talk about Yang.

youdao

It's all the fish that you caught, so there's nothing to be proud of if you had one big success.

关键在于你总共捕到过多少条鱼，而一次巨大的成功,没什么值得骄傲的。

耶鲁公开课 - 金融市场课程节选

So, I said I would announce it, that's the end of exam 1 material.

那么，我说过我会宣布的，到这里就是第一次考试内容的全部。

麻省理工公开课 - 化学原理课程节选

But there's something you'll note here also when I point out the case of the 2 s versus the 2 p, which is what I mentioned that I would be saying again and again, which is when we look at the hydrogen atom, the energy of all of the n equals 2 orbitals are exactly the same.

但是这里有一些事情你们也会注意到,当我指出2s和2p的情况，我之前提过,我会一次又一次的说，我们在观察氢原子的时候，2层轨道的所有n的能量,是完全相同的。

麻省理工公开课 - 化学原理课程节选