CNN news 2009-09-20 加文本

例句：Wreckage of the aircraft was scattered over a wide area.
      那架飞机的残骸散布范围很大。

2.undergo v.遭受,经历,忍受

例句：The castle will undergo extensive and costly renovations.
      那城堡要用钜资进行全面整修。

3.prudent a.审慎的,三思而后行的,精明的,节俭的

例句：He is a prudent businessman.
      他是个精明的商人。

      His friends say that he is too prudent, but he actually lacks confidence.
      朋友们说他过分谨慎，究其实，他是缺少自信。

4.vigilant a.警醒的,警戒着的,警惕的

例句：The dog kept a vigilant guard over the house.
      这只狗警醒地守护着这所房屋。

5.substantiate vt.使实体化,证实

6.safeguard v.保卫,保护

例句：It is obligatory for everyone to safeguard our motherland.
       保卫祖国人人有责。