CNN news 2009-12-18 加文本

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例句：Dentists had no financial incentive to extract teeth.
      把牙拔了对牙医们来说没有任何好处。

      Stock options are not much use as an incentive if the price at which they can be exercised is out of reach.
      如果执行价格太高，认股权的激励作用就不那么有效了。

2.afford vt.提供;花费,负担得起

例句：He is going to buy a new apartment, how can he afford doing that?
      他打算买个新房子，但他怎么支付得起呢？

3.volcano n.火山

例句：We saw several extinct volcanoes on our trip to Japan.
       我们去日本旅行途中看到了好几座死火山。

4.erupt vi. 爆发
vt. 喷出

例句：The region near the erupting volcano was evacuated rapidly.
      火山爆发处附近已迅速撤空。

5.document vt. 用文件证明，记录

例句：We should document the validation of our employees' driving licenses.
      我们应该为雇员驾照的有效性提供文件证明。

      Can you document the existence of life on other planets?
      你可以用资料证明其它星球上有生命吗？