際際滷shows by User: praewchar / http://www.slideshare.net/images/logo.gif 際際滷shows by User: praewchar / 際際滷Share feed for 際際滷shows by User: praewchar https://public.slidesharecdn.com/v2/images/profile-picture.png SWK Science-Math (vr11) | AYC short exchange program #3