There have been fundamental changes through time that make the role of the central bank evolve and change through time.

试图保持系统的稳定,随着时间的发展，基本的改变发生,使得中央银行的角色演变。

耶鲁公开课 - 金融市场课程节选

It's actually better to spend a certain amount of time just keeping your body in good condition

其实花一定时间保持身体的良好状态更好，

健康生活 - SpeakingMax英语口语达人

Cells can stop in their lifetime at some point in the cell cycle and persist for long periods of time.

细胞生命期可以停止在细胞周期的某个点,并保持很长时间

耶鲁公开课 - 生物医学工程探索课程节选

The goal of virtual office hours is if you're sitting down in mather or the quad or wherever, even off campus on some weekend, we'll still hold, not as many, but some virtual office hours.

虚拟办公时间的目标是，如果你坐在,院子里或其他地方，甚至是某个周末不在学校里,我们仍然保持联系，虽然不是很多，但是有一些虚拟办公时间。

哈佛公开课 - 计算机科学课程节选

All right? It's now something that I can search in constant time. And that's what's going to allow me to keep this thing as being log.

在固定的时间内搜索,这样就可以让时间复杂度保持在对数级,好的，考虑过了这些。

麻省理工公开课 - 计算机科学及编程导论课程节选

And I think you will wish you are continuing to make the investment in time. If you are down here, what I want you to do is talk to somebody.

我想你希望再接再厉,保持花在这么门课上的时间，如果你退步了，我要你做的就是和某人交谈。

麻省理工公开课 - 固态化学导论课程节选

And I think they were, at a certain point, holders of the record for the most losers.

我印象中他们有段时间，成了输掉比赛最多的纪录保持着。

普林斯顿公开课 - 人性课程节选

The glue, the key to identity across time for cars, is being the same hunk of stuff.

粘质，作为贯穿时间的车,其质的关键，就是要保持原来的这一大块。

耶鲁公开课 - 死亡课程节选