中山大學 SUN YAT-SEN UNIVERSITY The dialectic of theory and practice SFL as an appliable linguistics 2=∽zcz<z∽K Chang Chenguang School of foreign languages ∽cz,zcz Sun Yat-sen University 24 September 2010The dialectic of theory and practice: SFL as an appliable linguistics Chang Chenguang School of Foreign Languages Sun Yat-sen University 24 September 2010