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教师的教学不仅仅是传授知识，更应该重视培养学生自主学习的能力。学生学习能力的培养是一个长期的、复杂的过程，教师要在每一个教学环节上下功夫，精心设计每一个教学活动，长期坚持、日积月累，才能收到成效。现仅从“三垂线定理”的教学谈几点做法。 一、通过动手实验
The teacher’s teaching is not only to impart knowledge, but also to emphasize the ability of students to learn independently. The cultivation of students’ learning ability is a long-term and complicated process. Teachers must work hard in every teaching process and carefully design every teaching activity. Only long-term adherence and cumulative results can achieve results. Only from the teaching of the “three vertical line theorem” is a few points. First, through hands-on experiments