1。 那个可怜的女孩很难把情况向警察解释清楚。（difficulty）
That poor girl  had difficulty in explaning the matter to the policeman。
2。 天那么黑，所以小男孩只能摸着路走出大厅。
  （so。。that, by feeling） 
It was so dark that the boy could walk out of the hall by feeling 
3。 他只尝了一下便能辨认出各种茶叶。（recognize…by tasting） 
He recognized  different kinds of tea by tasting。
  
4。 尽管他年老多病，他把全部时间都投入了新机器的发明中。（in spite of） 
In spite of his old age and sickness , he spent all his time on invention of the new machine。
  
5。 由于工作劳累，他在四十多岁时身体就开始跨下来。（in his…。, fail） 
Due to his hard work , he failde in health in his forties。
6。 参加告别晚会的每个人都祝那位法国科学家身体健康和长寿。
  （wish） 
Every participant wished that French scientist good health and a long life。 
7。 我担心，你将不得不面对这样一个事实，只有百分之六十的毕业生能进入高校。
  （face the fact） 
I'm worried you have to face the fact that only 60% of the graduates can enter the universities。
8。 我还没有做出这道题目，但我正在做。
  （work on, work out） 
 I haven't work out this problem ,but I'm working on it。