该书的前六章，着重于对教授网络搜索技能的基础的讲述。
The first six chapters of the book are dedicated to laying the groundwork for teaching web search skills.
不过，陈教授指向了近年来快速兴起的网络视频和高清电视。
But Chan points to the explosion of the popularity of both Internet video and high-definition television in recent years.
Christakis博士说，他是哈佛大学一位研究健康和社交网络的教授。
Nicholas A. Christakis, a Harvard professor who studies health and social networks.
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