ºÝºÝߣshows by User: chenweitan / http://www.slideshare.net/images/logo.gif ºÝºÝߣshows by User: chenweitan / ºÝºÝߣShare feed for ºÝºÝߣshows by User: chenweitan https://cdn.slidesharecdn.com/profile-photo-chenweitan-48x48.jpg?cb=1523520706 ×ÔÓÉ~ Hi,everyone.I'm William.I just a normal person!