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Excerpt code: gwi4 I am deeply gratified that this book is about to be published. Middle school is an extremely important stage in the growth of teenagers. Physiologically, they are entering adolescence from adolescence, and their body shapes have undergone tremendous changes. Intellectually and morally, they are moving from naivety to maturity, and their world outlook, outlook on life and values are taking shape. In personality characteristics, dependence and independence coexist, and the tendency of independence is increasing day by day.