Studying weariness affects not only the instructive quality but also the student' s growth into a uaeful person.

厌学既影响教育质量又影响学生成才。大学生厌学是社会普遍关心的问题。进取心丧失；

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The project also found that using multiple measures to understand a teacher's performance -- including classroom observations, student surveys and growth in student achievement -- provides a richer and more reliable picture of a teacher's strengths and areas for improvement than any one measure alone.

CNN: Bill Gates: Invest in better teaching