慢速英语:American History Series: The United States Turns Inward After World War One

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例句：He sold his birds separately to separate buyers.
      他把他的鸟儿分别卖给不同的买主。
 
      He bought the parts separately and assembled his own computer.
      他一一买来部件,组装成自己的电脑。

2.chokingly adv.哽咽着

例句：But as you make preparations for the journey, you chokingly say goodbye, and unexpectedly shed a few drops of parting  tears.       

然而，当你倚装待发，哽咽着说声再会的时候，又不期然地要淌下几点伤离之泪...

3.seashore n.海岸, 海滨

例句：As we walked along the seashore we saw lots of tiny crabs.
      我们在海岸上散步时看到很多小蟹。

4.invention n.发明, 创造

例句：Necessity is the mother of invention.
      需要是发明之母。