/ http://www.slideshare.net/images/logo.gif / 際際滷Share feed for 際際滷shows by User: HelmuthTrefftz https://cdn.slidesharecdn.com/profile-photo-HelmuthTrefftz-48x48.jpg?cb=1583491048 I love teaching. I like to create opportunities for my students so they become the best persons and best professionals they can be. http://arcadia.eafit.edu.co/html/helmuthEnglish.html