/ http://www.slideshare.net/images/logo.gif / 際際滷Share feed for 際際滷shows by User: DavidChoi13 https://cdn.slidesharecdn.com/profile-photo-DavidChoi13-48x48.jpg?cb=1568790894 Creat Joiful life with OpticLight! http://www.techworksplus.co.kr