So, these are all involved with our ability to maintain homeostasis by exchanging materials with the external environment.

这个过程关乎人体维持内稳态的能力,内稳态通过与外环境进行物质交换来实现

耶鲁公开课 - 生物医学工程探索课程节选

And what we did is gift-giving.

我们进行了礼物交换。

麻省理工公开课 - 媒体、教育、市场课程节选

If we had the proper risk management institutions in place, people would have anticipated this risk and would have made swaps or other arrangements to protect themselves against it.

如果我们有合适的风险管理机构，人们能够预料到这种风险,能够提前进行交换或者其他安排,保护自己免受损失。

耶鲁公开课 - 金融市场课程节选

There's no change in them, and then we also looked at some at non-state functions, work and heat, and saw that those aren't zero going around a cycle. Of course you can do work in a cyclic process, and heat can be exchanged with the environment at the same time.

它们不会有变化，然后我们研究了,一些非态函数，功和热量，并看到,沿着循环行进一周的话,它们并不是零，当然你可以在,一个循环过程中做功，而同时热量可以在系统,与外界环境之间进行交换。

麻省理工公开课 - 热力学与动力学课程节选

Well,not personality,because after all, this doesn't end up with Shelly Kagan's personality before the torture.

不是人格，因为到最后，在进行折磨之前Shelly，Kagan的人格已经被交换了。

耶鲁公开课 - 死亡课程节选

These cells around the outside form the interface, the placenta, where the maternal blood circulation meets the embryonic circulation and nutrients are passed back and forth that way in a very highly regulated and important way.

外层的细胞形成接触面,即胎盘,是母血与胎血,进行血液交换,及营养物质交换的场所,整个过程高度有序并且非常重要

耶鲁公开课 - 生物医学工程探索课程节选