to be devoted to 和 concentrate on 差不多一样，both mean to give much importance to something, 不过。。 "be devoted to" is used when there is a longer period of time - such as a lifetime. It has an implication of lasting for a long time. 比如说： > i am devoted to my girlfriend = in my life my girlfriend is very important to me > i am devoted to science = in my life science is very important to me "concentrate on" is used more for current actions. There is an implication the importance will finish once the current action is finished. 比如说: > in class, i concentrate on the teacher = i pay attention to the teacher in class > when i massage i concentrate on the neck = when i give a massage i spend more time on the neck i guess in chinese it would be the difference between...专注　和　专心 my chinese is not very good though so could be wrong