concentrate on集中在; 专心于
concentrate upon集中在; 专心于
例句:
concentrate troops集结军队
concentrate fire集中火力(射击)
concentrate one's attention on [upon]把注意力集中在
concentrate sugar solution into syrup将糖的溶液浓缩为糖浆
You should concentrate on your work.你应该专心于你的工作。