VOA慢速英语:Dred Scott Ruling Opens the Whole Country to Slavery

1. announce vt.宣布; 述说
例句：Please announce to the children that there will be no school this afternoon. 
请通知孩子们今天下午不上课。  
 
2. reverse vt.（使）反转; （使）颠倒; 掉换
例句：This does not reverse that trend.
这并未逆转总的趋势。

3. justice n.正义; 公正
例句：Everyone should be treated with justice. 
每个人都应受到公正的对待。

4. consider vt.考虑; 认为
例句：There are two components to consider. 
有两个组成部分需要考虑。 

5. prevent vt.预防; 阻碍
例句：Past hurts prevent future relationships.
过去的伤害阻碍进一步的关系。

6. permit vt.许可，准许
例句：An enlightened government should permit the free expression of political opinion. 
一个开明的政府应当允许自由发表政见。