The rest may not even know they are infected. Hind Khatib is a regional director of the U.N.Joint Programme on HIV/AIDS or UNAIDS.

VOA: standard.2010.07.07

Thank you. Sorry, I've got the wrong glasses on but you're absolutely right, and in case the rest of you didn't hear it, n squared.

我看不清，但你绝对是对的,你们其他人可能没听清,是n的平方。

麻省理工公开课 - 计算机科学及编程导论课程节选