This paper makes a brief introduction to three pairs of mutual-contradictory guiding principles of teaching,which mainly represented by Stern,namely the intralingual-crosslingual dimension,the analytic-experiential dimension and the explicit-implicit dimension.As these dimensions are chosen from the strategic angle,they are regarded as strategies in this paper.In fact,it involves the long discussing acquisition-learning issue in foreign language teaching.It may give us some enlightenment on how to deal with the relationship between acquisition and learning in teaching practice.This paper aims to help English practitioners to deeply understand and use the principles scientifically and appropriately so as to improve the theoretical level and teaching quality.
