慢速英语:Discover America with American Mosaic!

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1. secede vt.从……中脱离
例句：They plotted to make the whole mississippi valley secede.
他们阴谋策划使整个密西西比流域脱离美国。

2. presidential adj. 指挥的；总统制的
例句：How many candidates are running in the presidential election?
有多少候选人参加总统竞选？

3. approval n.同意；批准；赞成
例句：I am afraid I can't give my approval.
我恐怕不能表示赞成。

4. preserve vt.保护；保存
例句：You can preserve meat or fish in salt.
你可以用盐保存肉或鱼。

5. announce vt. 宣布
例句：I was to announce a bride that night.
那晚我要宣布一位新娘.

6. provide vt. 提供
例句：We will provide suppressing fire!
我们会提供压制火力！
 
7. depression n.萎靡不振，沮丧
例句：This condition could be similar to human depression.
这一状况类似于人类的低落情绪。