课堂教学的引入,可引导学生的学习活动、调控课堂气氛、调动学生的注意力几个方面的作用。在教学中,教师可针对教学内容和学生已有的知识灵活地应用各种行之有效的引入方法,促使学生提高学习效率,从而不断地提高教学质量。 The introduction of classroom teaching can guide students’ learning activities, regulate classroom atmosphere and mobilize the attention of students in several aspects. In teaching, teachers can flexibly apply various effective introduction methods to the teaching contents and students’ existing knowledge to promote students to improve learning efficiency so as to continuously improve teaching quality.