VOA慢速英语:WHO Chief Warns of Risk to 'Winning Streak' for Public Health

例句：Any users of credit may overextend themselves.
      每个贷款使用者都有可能作出不自量力的事。

2.shortfall n.不足之量,差额

例句：There will soon be a shortfall in supply of qualified young people.
      合格年轻人才的短缺将很快出现。

3.govern vt.控制; 支配

例句：One can't completely govern one's thoughts at all times.
      人不能始终控制得住自己的思想。

4.frequently adv.频繁地,屡次地

例句：At one time we met frequently.
      过去我们曾常常见面。

5.undertaking n.（重大或艰巨的）任务，项目，事业；企业

例句：He associated himself with his friend in a business undertaking.
      他与朋友合伙经商。

      He is too timid to venture upon an undertaking.
      他太胆小,不敢从事任何事业。

6.intensify vt.vi.(使)增强, (使)加剧

例句：The drought has intensified.
      旱情加剧了。

7.stamina n.体力,耐力,持久力

例句：a severe test of stamina
      严峻的耐力考验

      Giving up smoking had a magical effect on his stamina.
      戒烟神奇地增强了他的体力。