Xu Yuchen is Professor of English at Foreign Languages and Literature Research Institute, Xi’an International Studies University. His research interests include Systemic Functional Linguistics, Semantics, and Discourse Analysis. He has published three monographs and over 20 research articles.Yan Xuan is Associate Professor in Stylistics, Lexicology and Psycholinguistics in the Department of English, School of Foreign Studies at Chang’an University. Su Rui is lecturer of the School of Foreign Studies at Chang’an University, interested in systemic functional linguistics.Kou Ying is lecturer at School of Foreign Language Studies of Chang’an University, interested in systemic functional linguistics, vague language and language evaluation.