VOA慢速英语:American History: German Sub Attacks Push Wilson Into War

例句：Switzerland declared its neutrality.
      瑞士宣布中立。

      They have been violently advocating neutrality.
      他们一直激烈地鼓吹中立。

2.unbelievably adv.难以置信地;不可信地

例句：They are unbelievably ignorant.
      他们无知到令人难以置信的地步。

      The band loan rate is unbelievably high.
      银行贷款利率高得太离谱。

3.total v.总计,共计

4.permission n.允许, 许可, 准许,批准

例句：Did he give you permission to take that?
      他允许你拿那个东西了吗?

      I have obtained a written permission from the chairman.
      我从主席那里获得了书面许可。

5.battlefront n.前线