There are some major causes for it. In the first instance, the improvement of students is the final goal of education. Only by giving comment on teachers performance can let teachers know the process of students development clearly. Furthermore, the criticism is the stimulus to teachers self-perfection and improvement in educational quality. Last but not least, the criticism itself is a kind of feedback and communication between teachers and students, lack of which will affect the educational outcome afterwards.

　　If the students have courage to make comments on their teachers, they will have more confidence to conquer the difficulties in the future. As a Chinese proverb says,the waves behind drive on those behind, so the new excels the old.Teachers will find their own disadvantage in the teaching to again and again.

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