VOA慢速英语:Physical Exercise Lowers Risk of Some Diseases, Experts Say

词汇讲解：

1. activity n. 活动;活动力
例句：He once engaged in anti-government activity.
他一度从事反政府的活动。

2. improve vt. 改进,改善
例句：He put forward a plan for improving the rate of production.
他提出了一个提高生产率的计划。

3. increase vt. 增大;增加;增强
例句：Travel increases one's knowledge of the world.
旅游增进人对世界的了解。

4. debate vt.  辩论,讨论
例句：They debated the question openly.
他们公开辩论这个问题。

5. separate vt. 分隔;分割
例句：The two communities are separated by a highway.
这两个社区由一条公路隔开。

6. guarantee vt. 保证;担保
例句：Perfect satisfaction is guaranteed to our customers.
保证我们的顾客完全满意。

7. valuable adj. 值钱的,贵重的
例句：He bought me a valuable diamond ring as a birthday present.
他给我买了一只贵重的钻戒作生日礼物。

8. advise vt. 劝告,忠告
例句：We advised her that she (should) wait.
我们劝她等。