N-UNCOUNT （尤指儿童的）注意力缺乏多动症（常使用缩略形式ADHD） Attention deficit hyperactivity disorder is a condition where people, especially children, are extremely active and unable to concentrate on anything for very long, with the result that they find it difficult to learn and often behave in inappropriate ways. The abbreviation ADHD is often used. （尤指儿童的）注意力缺乏多动症（常使用缩略形式ADHD）