「研究生班和本科生很容易就能區別開來，」在洛杉磯加利福利亞州立大學給我們研究生上工程學課的老師如此說。「我說『下午好』，本科生們回答說『下午好』。研究生們則把我說的話記在筆記本上。」

Difference

"I can always tell a graduate class from an undergraduate class," observed the instructor in one of my graduate engineering courses at California State University in Los Angeles. "When I say, 'Good afternoon,' the undergraduates respond, 'Good afternoon." But the graduate students just write it down."