concentrate on 意思是集中精力于
可直接接名词concentrate on sth
或接动词ing concentrate on doing sth
或 concentrate one's effort on sth/doing sth
例句如下：
* I can't concentrate (on my studies) with all that noise going on.吵闹声不绝於耳,我精神无法集中（於学习）.
* We must concentrate our efforts on improving education.我们必须致力於改进教育工作.
* Having failed my French exams,I decided to concentrate on science subjects.我因法语考试不及格而决心专攻理科.
* This firm concentrates on the European market.这公司把工作重点集中在欧洲市场.