He put the problem out of mind and concentrated on the work at hand.

He decided to concentrate on the four at the table first.

Did we learn better what it means to concentrate at the beginning of a game?

And then you have to concentrate your resources at the point of attack.

Better, she decided, to concentrate on one friend's problems at a time.

It also can lead to trouble concentrating at work and poor job performance.

Trying to clear his mind, he concentrated on the task at hand.

The majority of Soviet forces were concentrated at and along the southern front.

It was after that I concentrated on science subjects at school.

"We really have to concentrate on one thing at a time in terms of legislative effort."