[Wang, Yufan] Cent China Normal Univ, Natl Engn Res Ctr E Learning, Hubei Prov Key Lab Artificial Intelligence & Smar, Natl Language Resources Monitor & Res Ctr Network, Wuhan, Peoples R China.^[He, Tingting;Fan, Rui;Zhou, Wenji;Tu, Xinhui] Cent China Normal Univ, Sch Comp, Hubei Prov Key Lab Artificial Intelligence & Smar, Natl Language Resources Monitor & Res Ctr Network, Wuhan, Peoples R China.