BBC news 2011-01-25 加文本

1.The President Dmitry Medvedev immediately postponed his trip to Davos and promised those responsible would be tracked down.

track down追捕到, 追查出

例句：All citizens should help the police in tracking the criminals down.
      所有市民都应该帮助警察追捕罪犯。

      It was not long before I tracked down the lost watch.
      不久我就找到了遗失的表。

2.According to the Guardian, the Palestinian side agreed that only 10,000 Palestinian refugee families would return out of a total population of some five million.

out of从…之中，表达分数

借助介词表示分数，介词前的数词是分子，介词后的数词是分母。例如：

　　Ninety-nine people out of a hundred，if they were asked who first found America， would answer Clumbus．如果要问是谁首先发现美洲，一百个人中有九十九个（百分之九十九）将回答是哥伦布。
　　这种结构中的介词主要有in，out of，of以及to

3.It follows a call from the internationally recognised President of Ivory Coast, Alassane Ouattara, for a month-long ban on cocoa exports, which provide the main source of revenue for his rival Laurent Gbagbo, who's refusing to give up the presidency.

give up放弃;投降， 认输; 猜不出

例句：I can't answer that puzzle; I give up.
      我猜不出这个谜语, 我认输了。

      She will give up this journey.
      她将放弃这次旅行。

4.Cardinal Bagnasco said the young were being sold the idea that success came through moral compromise and selling yourself rather than hard work.

rather than而不是

例句：They thus increased their annual grain production rather than diminished it.
      他们这样增加了而不是减少了粮食年产量。