在英语越来越重要的21世纪，学好英语成了大学生的首要目标。为帮助大学生更好地掌握英语知识，特提供以下文章：
31.claim for sth要求，如：
Claim for delayed delivery 延误交货索赔
Claim for inferior quality 由于质量低劣而索赔
32.collision with sb/sth碰撞,冲突，如：
His car had a collision with a truck. 他的车子兴货车相撞。
Their minivan was in collision with an Army lorry. 他们的小货车兴军用卡车相撞。
33. comment on /about对……的评论，如：
What’s your comment on our operas?你对京剧的评价怎样?
Many customers have high comment on it. 许多顾客对此商品的评价很高。
34.connection between; 关系,连接，如：
The connection between the two events is remote. 这两件事之间没有什麽联系。
35. complaint of /about 报怨,控告，如：
I have a complaint of the chest. 我胸部不适。
Accept complaint about damage 接受货损抱怨
36. compromise between/on 折中,妥协，如：
Progress has been made towards a political compromise between the two nations. 两国之间的政治和解已经取得进展。
The final proposals were a rather unsuccessful compromise between the need for profitability and the demands of local conservationists.
最终的方案是受益者和地区自然资源保护者之间颇为勉强的相互妥协.
37.concentration on sth专心,集中精力，如：
Too much concentration on one aspect of a problem is dangerous. 过度专注于问题的一面是危险的。
Concentration of emotional energy on an object or idea. 聚精会神精神集中于某物或某种想法上
38. concentration of sth 集中,聚集，如：
Having a high concentration of acid. 酸性的含高浓度酸的
They strongly recommended concentration of offer. 他们极力建议集中报盘。
39. concern about/for/over担心，如：
There was also concern about the adaptation of laws exercise. 人们也非常关心关於法律适应化的工作。
There was also concern about the adaptation of laws exercise. 人们也非常关心关於法律适应化的工作。
40.confidence in 对……的信任,相信，如：
I have complete confidence in them. 我对他们完全有信心。
He inspired confidence in us. 他使我们获得了信心。