They are very productive, have lots of different critters, and they all depend on each other."

VOA: standard.2010.05.09

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

"There is already a drop in supply. Because, on the east side of the river, that is one of the most productive estuaries in the world for oysters.

VOA: standard.2010.05.08

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

In the face of such skepticism, members of the Engagement Project hope their proposed new strategies will help guide the Obama Administration to a more productive dialogue between the United States and the Muslim world.

VOA: standard.2009.04.24

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