What is work and leisure now in a society where you don't have to produce everything for yourself?

在这个社会你不用为自己生产一切,工作和闲暇又意味着什么呢

耶鲁公开课 - 美国内战与重建课程节选

And often, if you want to make a lot of it, you have to think about the thermodynamics of the system, how fast the reactions will go and kinetics, and then whether they'll go, the thermodynamics, and sometimes then you need to adjust the reactions, maybe use a transition metal to make it go better.

这种分子就不能正常工作，而且通常来说,如果你要大量生产一个东西,你必须考虑系统的热力学，反应速率和动力学,还有反应是否会发生，热力学，而且有时候你需要调整反应的发生。

麻省理工公开课 - 化学原理课程节选

There are more people who can work to increase the production, but beyond that point there are more people to feed than the production can produce, and that leads to a desire for expansion of the land available for cultivation.

越来越多的人从事工作,生产力得以提高,但是一旦突破临界值,花费就要超过所得了,它导致了对土地扩张的需求

耶鲁公开课 - 古希腊历史简介课程节选