That meant that people growing corn were less-- less vulnerable to having things wipe out entire crops because there were different types of crops planted around the world, so the world corn supply would never be threatened by anything.

也就是说只要人们种植玉米,整个粮食体系就不可能那么轻易被摧毁,由于世界各地种植着不同品种的玉米,世界玉米供应不会受到任何影响

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

You used to get checks in the mail; now you go on a website and you'll see that your dividends are credited to your account, but money is growing in your account as companies pay out dividends.

你过去习惯于通过挂号信取得支票,现在你登陆网站,就能看到股利自动分发到你的账户,公司支付了股利,帐户中的金额就会增加

耶鲁公开课 - 金融市场课程节选

If you think about what ancient food gathering habits used to be like, you see things like this where people are out gathering food that is growing naturally, and you can think about what would-- what sort of conditions this would create and what kind of hardships it would create.

如果你想知道古代食物采集的习惯,请看这张图,人类都在野外采集自然生长的食物,你可以设想到,条件有多恶劣,生存有多艰难

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选