Covariance is--we'll call it--now we have two random variables, so cov... I'll just talk about it in a sample term.

协方差是...我们有两个随机变量,x和y的协方差是,从样本的角度来说

耶鲁公开课 - 金融市场课程节选

Wilson, best known for his role as the aggressively clueless Dwight Schrute on TV's "The Office, " began his talk with random slides ("Here's a baby monkey riding a boar"), gags about the early days of the Internet and jokes about his postings on Twitter, where he has almost 3 million followers.

CNN: Rainn Wilson: "The Internet is the future of spirituality"

Instead of the usual rounds of talk shows and bookstore tours utilized by most publishers to promote a book, Jay-Z, Random House and ad agency Droga5 created a unique, innovative and interactive game to spread the word about this recent bestseller.

FORBES: Groupon, Jay-Z, Puma Know Well The Meaning of "Contagious"