VOA慢速英语:American History: A Dispute Over Cuba Leads to the Spanish-American War

例句：She's very unlike her mother.
      她一点也不像她母亲。

      It's unlike him to be late; he's usually on time.
      他不是会迟到的那种人, 他通常很准时。

2.promise vt.vi.允诺; 答应

例句：I can't promise.
      我不能应允。

      I want you to promise me.
      我想让你对我做出承诺。

3.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。

4.powerful adj.强大的, 作用大的

例句：Electric current is often powerful enough to kill a man.
      电流常强得足以致命。

权力大的, 有势力的

例句：Who is more powerful in your family?
      在你家里谁权力更大?
 
5.invasion n.武装入侵, 侵略, 侵犯, 侵入, 闯入

例句：The invasion of tourists brought life to the summer resort.
      大批游客涌入, 使这个避暑胜地热闹起来。

6.smokeless a.无烟的

7.surrender vt.vi.投降

例句：In the end they were forced to surrender.
      最后他们被迫投降了。

      He voluntarily surrendered himself to the police.
      他主动向警方自首。