BBC news 2011-02-20 加文本

1.They were initially confronted by riot police who opened fire with tear gas and shotguns, but the police then pulled back and left.

pull back(使)(某人, 尤指一组士兵)撤出阵地

例句：The platoon pulled back to safety.
      这一排士兵撤回到了安全地带。

2.For a short while, police in riot gear kept the protesters out, but then they suddenly stood aside and jubilant crowds pulled in.

stand aside站到一边

例句：Stand aside and let us past!
      闪开, 让我们过去!

3.In a word, it's not just joy that we're feeling, but relief that what had been difficult days for our colleagues are now over.

in a word总而言之

例句：In a word, I can't go out as I have many things to do.
      总而言之, 我不能出去, 因为我有许多事情要做。
 
4.Soldiers fired shots and tear gas to disperse hundreds of protesters who called for Laurent Gbagbo, who refuses to step down, to hand over power.

hand over让与, 移交;送交

例句：He has resigned and will hand over charge of his office today.
      他已辞职, 将在今日办移交手续。

      They were handed over to a military tribunal for trial.
      他们已被交给军事法庭审判。

5.They believe that by analysing the genes of more plants, they'll be able to build up a library of properties, with which plant breeders can create new varieties suited to local circumstances.

build up逐步建立, 增进, 增强,使增大

例句：The pressure on the enemy is building up.
      对敌人的压力在不断加强。