小圈·中圈·大圈闫玉才有人把知识比喻为三个圈：小圈、中圈和大圈。小圈是指个人所掌握的知识，中圈是指人类已经掌握的知识，大圈是指人类还未探索的知识。研究小圈、中圈和大圈有何意义呢？它可以在学习态度和学习方法等方面给我们以有益的启示。先说小圈。研究小圈，... Small circle in the circle Large circle Yan Yu Cai Some people compared the knowledge of three circles: a small circle, the circle and the big circle. Small circle refers to the individual's knowledge, the circle refers to the knowledge that mankind has mastered, and the large circle refers to the knowledge that mankind has not yet explored. What is the point of studying small circles, middle circles and big circles? It can give us useful inspiration in learning attitude and learning methods. Start with a small circle Research circles, ...