Due to the requirements of the program, it is necessary to understand something called a covariance, and the results have discovered that more fun things, I thought of China's education.
Students ask questions, teachers answered, answered a simple example, but did not have a little more annotation;
Students ask questions, teachers answered, I didn't understand, I'm going to be slightly;
Students ask questions, teachers answer, answer content: The situation involving probability has seriously exceeded the scope of examination, do not have to master;
Students ask questions and content: Teacher: I didn't understand.
Teachers answer again, content: Don't have to master it all, don't involve the exam.
Students ask questions: I don't understand a calculation formula, and I don't understand the conclusions!
Teachers repuria, content: I believe you don't understand if you don't understand, please say specific questions.
Oh, think about your own experience, many places are the same as this.
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