Instead, use the Blackboard to help teaching and learning is rapid. Because teachers often prepare the image or text to describe came. Any text that is passed, it can come back to see again without burning.
Use the blackboard The teaching is fast. Because teachers often prepare images or text to accompany the lecture. Message is passed Was able to watch it without rewriting.
Instead of the blackboard. To help course is rapid. Because the teacher is often prepared images or text to describe comes, which passed. They can look back again without rewriting.