It's hard to concentrate on a book with all these people around.

He must concentrate with every part of him, mental and physical, on the job at hand.

"I don't know how you can concentrate with everything that's on your mind."

But how the hell was she supposed to concentrate with all that going on?

How can a man concentrate his mind with all this noise?

He's concentrating with all his might on what he wants the bees to do.

It just means that council housing will concentrate the people with the most problems in the same place.

The party's voters are concentrated in larger cities, especially those with a university.

Most of the buildings are concentrated around a town square with trees.

It is also not known if he concentrated these special trades with one firm or many.