利用建构主义可以比较好地说明人类学习过程的认知规律。在建构主义学习环境下,情境创设是教学设计的重要内容之一。通过学习情境的设计,把学生的被动学习变为主动学习,提高学生的学习兴趣和积极性。机械结构认识单元采用了诸如提供实例、应用于不同情境、给予不同的思考、合作学习等灵活多样的形式帮助学生探索不同的想法,在实践中构建学生的知识体系。 The use of constructivism can better explain the cognitive rules of human learning process. In the constructivist learning environment, situational creation is one of the important contents of instructional design. Through the design of the learning situation, the students ’passive learning becomes the active learning, so as to enhance students’ interest in learning and enthusiasm. The mechanical structure recognition unit adopts various flexible and diverse forms such as providing examples, applying to different situations, giving different thinking and cooperative learning, helping students to explore different ideas and building students’ knowledge system in practice.