/ http://www.slideshare.net/images/logo.gif / ºÝºÝߣShare feed for ºÝºÝߣshows by User: YvonneEngeng https://cdn.slidesharecdn.com/profile-photo-YvonneEngeng-48x48.jpg?cb=1523221722 ¼òµ¥µÄ¿ìÀÖ ¾ÍÊÇÐÒ¸£