1concentrate (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。