It used to be that you had to big thick course packets that cost a lot of money, but now everything thankfully is available electronically on the course website.

过去你们总是,有厚厚的一打昂贵的资料,好在现在所资料都是电子版的,能在课程网站上得到

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选