This was the time for the crew to test all the spacecraft systems.

VOA: special.2009.07.15

All of that somewhat complicates the picture, but at the same time, I think you can see that there is a connection between those semiotic systems.

这理解起来可能很复杂，但是你们还是能看到,这些符号系统间的一些联系。

耶鲁公开课 - 文学理论导论课程节选

So we know we always want to have our systems in as low an energy as possible, so it makes sense that a bond would happen any time we got a lower energy when we combine two atoms, versus when we keep them separate.

我们知道我们总是希望使我们的系统,处于能量尽可能低的状态，因此就应该有化学键产生,一旦我们合并两个原子之后体系的能量变得更低，相较于分开时。

麻省理工公开课 - 化学原理课程节选

I'm going to talk about - take sort of the general concepts that we talked about last time and talk about how they apply in two physiological systems, the nervous system first and then the immune system.

我将要谈到几个基本的概念,我上节课已经讲过一些了,再讲讲这些概念在两个生理系统中的应用,首先是神经系统然后是免疫系统

耶鲁公开课 - 生物医学工程探索课程节选