VOA慢速英语:Brains Gain From Physical Activity by Older People

短语讲解：

1. People may be considered to have dementia if they lose abilities in two or more areas such as memory and language skills.

such as像, 例如
例句：We dislike people such as him.
我们不喜欢像他这号人。

2. Most studies of exercise and dementia depend on self-reporting -- asking people to report their levels of physical activity.

depend on依赖, 依靠
例句：My success depends on my friend helping me.
我的成功是依靠我的朋友帮助我。

3. The study lasted five years. Almost two hundred people took part.

take part参加，参与
例句：It's mostly young people who take part. 
参加活动的绝大多数是年青人。

4. Those with higher activity energy expenditure had ninety percent reduced risk of incident cognitive impairment over the follow-up period compared to those with very low activity energy expenditure.

compare to与…相比
例句：The writer was compared to Shakespeare.
把这个作家与莎士比亚进行了比较。

5. In a second study, French researchers reported on exercise and dementia in women with heart risks like obesity or diabetes.

report on报道…, 就…作报告
例句：At the end of every term a schoolmaster reports on each of his pupils.
每学期结束时, 教员都要报告每位学生的情况。

6. He says the findings add to the evidence about the mental value of physical activity.

add to增加, 加强
例句：This lesson adds to the value of the book.
这一课增加了这本书的价值。