/ http://www.slideshare.net/images/logo.gif / ºÝºÝߣShare feed for ºÝºÝߣshows by User: lingchaozhao https://public.slidesharecdn.com/v2/images/profile-picture.png A contented mind is a perpetual feast. ÈÈÇ飬ÀäÄ®£¬Ä¾£¬»ý¼«