1.secede v. 正式脱离或退出,分离
例句：One of the states has seceded from the federation.
有一个州已从联邦中退出。
2.enforce v. 实施,执行;强制,强迫;加强
例句：The teacher enforced the principle by examples.
这教师引用实例极力强调这原则。
3.postpone v. 延迟,使延期,缓办,搁延
例句：The sports meet was postponed because of rain.
运动会因雨延期。
4.swarm v. 群集,聚集一块,云集,爬树
例句：The students swarmed towards the playground.
学生们一窝蜂似地奔向操场。
1.At most, said Anderson, there was enough food for forty days.
at most至多
例句：It should only cost at most thirty dollars.
它最多只要三十元。
2.He said it would take months to prepare the warships and soldiers for such an effort.
take sometime to do sth花费时间做某事
例句：It took me three hours to finish the work.
我花了三小时才做完这项工作。
3.Treasury Secretary [Salmon] Chase was for the plan only if Lincoln was sure it would not mean war.
only if只有
例句：The lawyer is paid only if he wins.
律师只有赢了官司才能拿钱。
4.If an attempt is made to put more men in Fort Sumter, a war cry will be sounded from every hilltop and valley in the South.
make an attempt to do企图
例句：He made an attempt at suicide.
他试图自杀。