Work with these kids has shown that catching a problem early is key to recharting its course, according to the CDC.
WSJ: ADHD Warning Signs and Kids: Growing Pains or Cause for Concern?
英汉双解词典包含3185865条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。