狠狠撸shows by User: jasonckam / http://www.slideshare.net/images/logo.gif 狠狠撸shows by User: jasonckam / 狠狠撸Share feed for 狠狠撸shows by User: jasonckam https://public.slidesharecdn.com/v2/images/profile-picture.png 思而不学则殆,学而不思则罔。