You should concentrate on studying.
解析：You 你们 should 应该 concentrate on 专注于做某事 study 学习
集中精力的英文还可以翻译为：
1、focus on
造句：You should focus on studying.
2、pay attention to
造句：You should pay attention to studying.
3、keep one's mind on
造句：You should keep your mind on studying.
4、devote oneself to
造句：You should devote youself to studying.
5、be absorbed in
造句：You should be absorbed in studying.
6、be engrossed in,
造句：You should be engrossed in studying.
7、be immersed in.
造句：You should be immersed in. studying.