/ http://www.slideshare.net/images/logo.gif / ºÝºÝߣShare feed for ºÝºÝߣshows by User: cengtxiang9 https://public.slidesharecdn.com/v2/images/profile-picture.png Wisdom first teaches what is right. ??????????????????????????????????????? ÖÇ»ÛÊ×ÏȽÌÈËÃ÷Àí.