我后来再次见到过这种场景，但一次就已经足够了。

I was to see that sight again, but once was enough.

youdao

可以选择几个期间，但一次只能选择一个现状。

You can select several periods but only one actuality at the time.

youdao

可以选择复制几个期间，但一次只能选择一个现状。

You can select several periods to copy for, but only one actuality at the time.

youdao

But the idea that they're all kind of independent, points out once again that they are playing polyphonic texture.

但它们基本上相互独立这一点,再一次证明,这是一个复音织体

耶鲁公开课 - 聆听音乐课程节选

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

We can't actually go ahead and derive this equation of the wave function squared, because no one ever derived it, it's just an interpretation, but it's an interpretation that works essentially perfectly.

从这个方程中,导出，波函数的平方，没有人可以这样做，这仅仅是一种解释，但这种解释，能解释的很好，自从它第一次被提出来之后。

麻省理工公开课 - 化学原理课程节选