1.blockade n. 阻塞

例句：Enemy ships tried to run the blockade.
      敌军船只企图突破封锁线。

      One that penetrates or evades a blockade.
      偷渡者穿过或偷越封锁线的人

2.underwater a. 在水中的

例句：Duck disappeared underwater.
      鸭子潜入水中了。

      swimmers is the underwater tricycle race.
      这些幼小的游泳运动员非常喜爱的一项运动就是水下三轮车比赛。

3.unconscious a. 失去知觉的,不省人事的;无意识的,不知不觉的

例句：I was rendered unconscious by the blow.
      猛烈一击使我失去了知觉。

例句：The injured man is unconscious but still alive.
      受伤的人不省人事但仍活着。

1.There was a great deal of fighting between the Union and Confederate navies.

a great deal of很多的

例句：She hinted at having won a great deal of money.
      她暗示她赢了很多钱。

2.The Union victory might not have been possible without the successes of its navy.

without虚拟语气

非真实条件句中的条件从句有时不表示出来，只暗含在短语或上下文中，这种句子叫做储蓄条件句。常见的有but,for ,without等引导的短语，以及or, or else, otherwise, but 等后面的分句。

例：But for your help we couldn’t have succeeded in the experiment.
如果没有你的帮助，我们的实验室是不会成功的。

例：We could have done better under more favourable conditions.
在更有利的条件下，我们能够做得更好些。

3.He wanted to prevent the South from shipping its agricultural products to other countries in exchange for industrial goods.

in exchange for交换,以此易彼

例句：I will give you a candy Bar in exchange for your soda pop.
       我要以一支棒棒糖换你的苏打汽水。