BBC news 2010-09-01 加文本

1.President Obama has marked the formal end of American combat missions in Iraq by visiting a military base in Texas to pay tribute to US troops.

pay tribute to称赞, 歌颂

例句：I believe for a business to succeed， it has to pay tribute to Buddha.
      我相信一个事业要成功，就必须拜佛进贡。

2.Rwanda says it's preparing to pull out its peacekeeping troops from Sudan if the United Nations publishes a report accusing Rwandan forces of involvement in genocide in the Democratic Republic of Congo.

pull out退出

例句：The invading troops are pulling out of the occupied area under international supervision.
      入侵部队正在国际监督下撤出占领区。

3.We don't take it lightly as some people have said that we are trying to blackmail the United Nations, and we don't.

take it lightly掉以轻心

例句：We must get a firm grip on this problem now and deal with it in earnest. All cases must be handled promptly and in    general severely. We cannot afford to take them lightly and be too lenient.
       这个问题要认真地搞，而且在近期要抓紧，处理要及时，一般地要严，不能松松垮垮，不能处理太轻了。

4.Earlier, the Iranian foreign ministry urged the country's media not to insult foreign dignitaries, but the hard-line Iranian newspaper, Kayhan, which carried the original comments has stepped up its attack against Ms Bruni.

step up(使)增加, (使)加快速度

例句：The girl stepped up to school.
      女孩子加快步伐去上学。

      He has stepped up into the management of the firm.
      他已升入公司的管理部门。