Analysis and application of public opinion in the era of big data 并列题名：Analysis and application of public opinion in the era of big data Analysis of educational public opinion from the perspective of big data Theoretical exploration of economic innovation in the era of big data Analysis and application of international trade data Analysis and application of ecological lot monitoring data Analysis of network public opinion in the big data era analysis and application of ultrasonic field 并列题名：Theoretical exploration of economic innovation in the era of big data Analysis and judgment of public opinion of blog