Presented with many pictures. Use the letters to at least try to find pictures, graphs or diagrams, charts the past due in lecture instead of using letters, because the letters. . so tightly to slide to move the audience uncomfortable, bored, interested to listen.And in the end will sit sleep. Which of course trainers all don't want to see such a sight in describing their images used must be meaningful. The objective in accordance with the gist of the slide it.