While both types of kids are excessively active, the naughty child's behavior is purposive and filled with vitality. The hyperactive child, on the other hand, is just doing aimless and unproductive "busywork".
同樣是活動量高，頑皮小孩的活動是有目標、有生產力的；過動兒的活動卻是沒有生產力的「忙、茫、盲」。