/ http://www.slideshare.net/images/logo.gif / 狠狠撸Share feed for 狠狠撸shows by User: jiomann https://cdn.slidesharecdn.com/profile-photo-jiomann-48x48.jpg?cb=1523100957 A wise man learns by the experience of others. An ordinary man learns by his own experience. A fool learns by nobody's experience.