at one time with another

In fact, there is another type of friend—one that has not been with us for a long period of time, but fills our mind at some moment.

事实上，还有另一种朋友，他虽然很长一段时间没有和我们在一起，但却会在某个时刻充满我们的心灵。

Most of us, at one time or another, have been struck with the thought that we might mistake a dream for reality, or reality for a dream.

我们中的大多数都曾经有过这么一种想法：我们可能将一个梦境误认为是现实，或者将现实误认为是梦境。

With the standard three channels of NASA TV streaming, plus the Space Station views stream, we were broadcasting eight unique feeds of video at one time, another first.

通过NASA电视台的三个常规频道的播出，以及在空间站上的播放，我们同时提供了八个不同的视频源，这是又一个第一次。