新型冠状病毒肺炎相关的推特主题与情感研究(Exploring COVID-19-related Twitter Topic Dynamics across Countries) Shuailong Liang author Derek F Wong author Yue Zhang author 2020-10 text zho Proceedings of the 19th Chinese National Conference on Computational Linguistics Maosong Sun editor Sujian Li editor Yue Zhang editor Yang Liu editor Chinese Information Processing Society of China Haikou, China conference publication liang-etal-2020-xin https://aclanthology.org/2020.ccl-1.66/ 2020-10 707 718