A recent study reported on almost twenty years of different tillage methods in the American states of Colorado, Kansas and Nebraska.

最近的一项研究报导了美国科罗拉多州，堪萨斯州，内布拉斯加州将近二十年里的不同耕作方法。

youdao

Still, some psychologists quoted in the same issue of American Psychologist questioned how comparable this study is to Milgram's, given the differences in methods.

CNN: Charting the psychology of evil, decades after 'shock' experiment