/ http://www.slideshare.net/images/logo.gif / 際際滷Share feed for 際際滷shows by User: AlexTseng777 https://cdn.slidesharecdn.com/profile-photo-AlexTseng777-48x48.jpg?cb=1523474841 Affinity, time, socialization--they are the origin of friendship regardless of the elapse of time; if one is out of the three elements, friendship will disappear step by step until it's totally gone.