VOA慢速英语:Physical Activity in Teens Linked to Mental Skills in Late Life

2.impairment n.损害;损伤

例句：A mental or physical impairment; a defect.
      缺陷脑力或体力上的弱点；缺陷

3.physically adv.体格上，身体上

例句：All the children had been physically and emotionally abused.
      所有这些儿童的身心都受到了摧残。
 
      Are you sure you’re physically tough enough for this job?
      你确信你有足够的体力胜任这份工作吗？

4.particularly adv.特别; 尤其

例句：He isn't particularly clever.
      他并不特别聪明。

5.independent adj.自主的；有主见的

例句：Children should be encouraged to be independent thinkers.
      应该鼓励孩子独立思考。

      He is economically independent.
      他在经济上是独立的。

6.sleepy adj.欲睡的;困乏的

例句：Her yawn suggests that she is sleepy.
      她打哈欠表示她很困了。