上球类课时课堂组织易乱易散，教师有时难以组织和观察。鉴于此，笔者尝试介绍一种圆周练习法，能较好解决上述问题。画大小为５米和９米的同心圆两个，并将学生分成两组在同心圆周上站立，教师在圆心处，讲解时学生到小圆处。１波浪式：在不同的圆周上进行两人间的传接... Classroom classes on the ball easy to mess, teachers sometimes difficult to organize and observe. In view of this, I try to introduce a practice method of circumference, can better solve the above problems. Draw two concentric circles of 5 and 9 meters in size, and divide the students into two groups standing on concentric circles with the teacher at the center of the circle and the student at the small circle. 1  wave-like: in different circles for two people between the transmission ...