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Do you have to have a blackboard when you speak? What is the content of the blackboard writing for, and finally write it out or talk about it while writing?
Writing on the blackboard is very necessary, and the content is the most essential part of your class. If you are given a class, you can write down anything you say in class on the blackboard.
Writing on the blackboard can be done at the end or when you are talking. Compared with the two, this level is higher and the effect is better, but it is more difficult.