Factor A is training mode, comprising two levels: A1, serial folk play training activities, i.e. experiment group; A2, non-folk play training activities, i.e. control group (in which training methods, such as dancing, singing and story-telling areused).

• 因素A：训练方式，包括二个水平，a1：系列化的民间游戏训练，即实验组，A2：非民间游戏训练活动(如跳舞、唱歌、讲故事等)，即对照组。