overactivity

例句：

1. 1. He has been diagnosed with attention deficit hyperactivity disorder (ADHD).
   他已经被诊断出患有注意力缺陷多动障碍。
2. 2. The child is overactive and often gets into trouble.
   这个孩子过于活跃，经常惹麻烦。
3. 3. The teacher noticed that the student was overactive during class.
   老师注意到这个学生上课时过于活跃。