情感識別用于識別整体的取向(正性 负性 中性) 但嘲諷能使极性翻轉
情感分析用于決策 With the explosive growth of social media on the web, individuals and organizations are increasingly using this content in decision making [21]
[21] B. Liu, “Sentiment analysis and opinion mining,” Synthesis Lectures on Human Language Technologies, vol. 5, no. 1, pp. 1–167, 2012.
contrast between negative sentiment and positive situation