1 concentrate (sth) (on sth/doing sth) to give all your attention or effort to sth 专心致志；集中精神: I need to concentrate on passing this exam. 我需要集中精力，争取考试及格。I tried to concentrate my thoughts on the problem. 我努力让自己的思绪集中在这个问题上。

2 to come together or to bring people or things together in one place 集合；集中；聚集: Most factories are concentrated in one small area of the town. 大部份工厂集中在镇上的一小片地方。