Assistant, associate and full professors perform many duties. They teach classes. They advise students. And they carry out research.

助理教授、副教授和正教授需要履行众多职责，他们需要授课、指导学生，还要做研究。

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In 2010, Johan Bollen, an associate professor at Indiana University and two other professors published research showing how using Twitter could with more than 85% accuracy predict the daily up and down readings of the Dow.

WSJ: In the Wired World, Feeds Drive Trading