Once it became true that people could raise food or gather food, or produce food for more than just themselves or their families, meant that people were free to do other things.

这些成为现实之后,人类不仅仅能为他们自己或家人,种植,收集或制造食物,也就是说人们可以有空来做别的事情

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

Okay. Then you can look at how many things like cows are raised in the United States, and how many acres there are of carrots, or wheat, or corn, or whatever it is.

好了,然后就可以看看,比如,美国养了多少头牛,种植了多少英亩的胡萝卜,小麦,玉米,或其他东西

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选