队员身心特征：三年级队员正处于儿童期向少年期过渡阶段。这个阶段是他们成长过程中身心发展的一个“活跃期”和“突变期”。此时的队员好奇心特别强,求知欲旺盛,具有活跃、发展快、不稳定的心理特点。他们有意注意开始延长,对自己的情绪有了一定的控制能力；观察具有一定的深刻性,想象力丰富,自我意识不断增强,对成 Physical and psychological characteristics of team members: Third-grade members are in the transitional period from childhood to adolescence. This stage is a period of “active period” and “mutation period” of their physical and mental development during their growth. At this point of the team curiosity is particularly strong, strong curiosity, with active, fast-growing, unstable psychological characteristics. They are interested in starting to lengthen, have some control over their own emotions, have certain profoundness of observation, have rich imagination, continuously increase self-awareness,