1. Guangdong University of Foreign Studies,Center for Linguistics and Applied Linguistics, and Laboratory of Language Engineering and Computing,Guangzhou,China,510006
2. South China Normal University,Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices,Guangzhou,China,510006
3. School of Computer Science and Cyber Engineering, Guangzhou University,Guangzhou,China,510006
4. Guangdong University of Foreign Studies,Modern Education Technology Center,Guangzhou,China,510006