/ http://www.slideshare.net/images/logo.gif / 際際滷Share feed for 際際滷shows by User: ngyjian5 https://cdn.slidesharecdn.com/profile-photo-ngyjian5-48x48.jpg?cb=1528431762 A man who knows history knows his identity; A man who knows his presence knows his value of existence; A man who knows his future knows his hope.