VOA慢速英语:Obama, Democrats Aim Voting Appeals at Young People

例句：Please define the words.
      请准确地解释这些字的意义。

      They defined him as a rogue.
      他们确定他为骗子。

规定, 确定

例句：Please listen while I define your duties.
      在我规定你的职责时, 请仔细听好。

2.dissatisfaction n.不满, 不平

例句：She expressed her dissatisfaction with him.
      她对他表示不满。

3.advocate vt.提倡, 主张

例句：I don't advocate doing such things.
      我不主张干这样的事情。
 
4.registration n.登记,注册,挂号

例句：a car’s registration document
      汽车登记证

      Certain charities are exempt from VAT registration.
      某些慈善机构无须进行增值税登记。