1） 他今天准是累了，他没办法把注意力集中在工作上。
（He must be very tired today， he just couldn't focus his attention to his work.）
2） 她感觉非常不自在，由于所有些目光都注视着她。（She felt very uneasy1 as all eyes were focused on her.）
3） 这本书着重谈了中东的形势。（This book focuses on the situation in the Middle East.）
a number of 的意思是很多。请看下面的例句，注意a number of 和the number of 有什么区别：
1） A number of factories have been shut down because of pollution problems.
（因为污染问题很多工厂被关闭了。）
2） A number of students have handed in their application forms.（很多学生都递交了申请表。）
3） The number of students in our school increases every year.（大家学校的学生人数每年都在增加。）
4） The number of passengers who were injured in the accident is still unknown.
（在事故中受伤的乘客人数还不了解。）
2. It is useful to know how these principles work.
it 在句中做形式主语，真的的主语to know how these principles work，此类结构大家在第一和第二单元已有知道。请看下面的句子：
1） It is necessary to learn how to use the computer.（掌握怎么用计算机非常有必要。）
2） It is important to find out why the forest fire broke out.（找出森林大火是什么原因非常重要。）
3） It is difficult to know what he is thinking about.（要想了解他在想什么非常困难。）
work 在本句中的意思是起用途；产生影响，请翻译下面的句子：
1） The doctor said that the medicine would work.（大夫说药会起用途的。）
2） They didn't think his plan would work.（他们觉得他的计划行不通。）
3） They didn't expect that the teacher's encouragement would work such a change in him.
（他们没料到老师的鼓励会使他产生这样变化。）
3. Meaningfulness affects memory at all levels.
affect 是动词，意思是影响。常常会有一些英语学习者把动词affect和名词effect混淆，请注意下面的句子：
1） The drought2 would surely affect the harvest.（这场干旱一定会干扰到收获。）
2） Excessive3 smoking affected4 his health， bad coughs often made it difficult to breathe.
（过度抽烟影响了他的健康，紧急的咳嗽使他很难呼吸。）
3） Psychologists believe that colors have a definite effect on people.
（心理学家觉得颜色对人一定有影响。）
4） We could all see the effects of the illness on him.（大家都能看出那场病在的身上的影响。）
5） 职务的变化使他的收入大受影响。（The change in position greatly affected his income.）
6） 他的话对听众没任何影响用途。（What he said had little effect on the audience.）
4. Information that doesn't make any sense to you is difficult to remember.
that引导的定语从句修饰information； 主句是Information is difficult to remember.
不定式to remember 用在做表语用的形容词后面作状语。请看下面的句子：
1） Einstein was easy to get along with.（爱因斯坦比较容易相处。）
2） To many foreigners， Chinese is hard to learn.（对很多外国人来讲汉语非常难学。）
3） The water in this river is not fit to drink.（这条河里的水不合适饮用。）
4） This question is very difficult to answer.（这个问题非常难回答。）
make sense 的意思是有意义；可理解。请看下面的句子：
1） No matter how you read it， this sentence doesn't make any sense to me.
（无论你如何读，我都不理解这个句子。）
2） What the writer wanted to express in his book doesn't make any sense to the readers.
（读者们没办法理解作者在书中所要表达的意思。）
3） His explanation makes no sense to his students.（学生们不理解他的讲解。）
5. Organization also makes a difference in our ability to remember.
动词不定式to remember在句中做定语，修饰名词ability.请看下面的句子：
1） You should have confidence in your ability to fulfill5 the task.（你们应付自己完成认务的能力有信心。）
2） He has kept the promise to come early in the morning.（他遵守了一大早来的诺言。）
3） They have the determination to overcome all the difficulties.（他们有克服所有困难的决心。）
4） We could see her anxiety to solve the problem.（大家能看出她急于解决这个问题。）
make a difference 的意思是有关系；有影响；起用途。请看下面的句子：
1） What he said would not make any difference in my decision-making.
（他说的话不会对我做决定产生任何影响。）
2） Your participation6 in the work will make a great difference.（你参与大家的工作，状况就不同了。）
3） Money won't make much difference to him.（钱对他起不了多大用途。）
4） I didn't like the appearance of the house， but the location and price made all the difference.
（我不喜欢那房屋的外观，但它的地方和价格起了要紧用途。）
6. Material that is organized is better remembered than jumbled7 information.
句中的better是副词well的比较级形式，意思是更好地。请看下面的句子：
1） This story is better written than that one.（这个故事写得比那个好。）
2） This room is better furnished than that one.（这间屋子装饰得比那间好。）
3） This team is better trained than that one.（这个队练习得比那个队好。）
4） This job is better paid than that one.（这份工作的报酬比那份高。）
information是一个不可数名词，不可以在其后加-s。请看例句：
1） There are many ways of obtaining information.（获得信息的渠道不少。）
2） So far I haven't got any information about the game.（我到今天还没得到有关比赛的任何消息。）
3） I am sure this piece of information will be of great value to them.
（我一定这一消息对他们会非常有价值。）
