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.
concentrate to后面一般加动词,意思是专心去做某事.不知对不对,靠大家了
