So the food environment can change and can change in productive ways and there are a lot of signs of this happening.

食品环境可以改变并可以很有创造性改变,有很多迹象都可以证明这一点

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

Of course, he turns it into productive purpose, so there are a couple examples from that article.

当然,他将其转化为有成效的想法,那篇文章上有一些例子

耶鲁公开课 - 金融市场课程节选

In 1860 slaves as an asset were worth more than all of America's manufacturing, all of the railroads, all of the productive capacity of the United States put together.

860年,奴隶作为财产的产值超过了,美国所有的制造业,所有的铁路,和所有产业的产值总和

耶鲁公开课 - 美国内战与重建课程节选

And furthermore from that, let's say they survive and then they become productive members of society who go home and start like a million charity organizations and this and that and this and that.

此外，假定他们活了下来,回家以后成为对社会更加有益的公民,比如创建了无数的慈善机构,或者诸如此类的。

耶鲁公开课 - 公正课程节选

That led to an attitude among a good segment of our society that it's okay to go out and make money because making money means doing productive things for the economy and ultimately it's a benefit to society.

这致使我们社会中的很大一部分人,有这样的观点,就是,出去赚钱没什么不好的,因为赚到钱意味着,为经济作了贡献,并且最终将有益于社会

耶鲁公开课 - 金融市场课程节选