Educators say the goal will be to improve student academic performance in math, science and technology courses, while giving them the tools they need to build lasting professional careers in a 21st-century, knowledge-based economy.

VOA: standard.2010.05.10

Isn't the distinction between friend and enemy ? based on a kind of knowledge, on a perception of ? who is your friend and who is your enemy?

朋友与敌人之间的差别,不是根据知识吗，或是你对,谁是朋友或敌人的看法？

耶鲁公开课 - 政治哲学导论课程节选