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With the rapid development of mobile Internet, the social network has become an important platform for users to receive, release, and disseminate information. In order to get more valuable information and implement effective supervision on public opinions, it is necessary to study the public opinions, sentiment tendency, and the evolution of the hot events in social networks of a smart city. In view of social networks' characteristics such as short text, rich topics, diverse sentiments, anddoi:10.1155/2020/9789431 doaj:ea59ea043b7a47fb84addff8c20af4da fatcat:ootud5h3ljflzcoobfe2p67xom