Yet this unusual concentration has also created a certain isolation.

There he found an unusual concentration of just the kind of people he wanted to be like.

No unusual concentrations of any wildlife species are known to occur in the area.

There seems to be an unusual concentration of schismatic religions in this colony world.

The congregation is notable for the unusual concentration of distinguished scholars among its members.

They are so awkward to hold that they require unusual concentration and care.

This unusual concentration on creating a relaxed mood paid frequent dividends.

There are seeming pockets of unusual concentrations within Europe.

The group features an unusual concentration of political enmities.

The 23 guitarists, an unusual concentration of instruments, sound overdubbed.