Its bulk was concentrated in the middle, with a small aperture at the very center.

It is mostly here that the bulk of Russian industry was concentrated in the 18th and 19th centuries.

For some time, the bulk of the market's gains have been concentrated in a small number of big, well-known companies.

The bulk of the enemy is concentrated around the Knuckle.

The bulk of yesterday's buying was concentrated in long-term Treasury securities.

The bulk of the day's activity was concentrated in short-term Treasury bills.

The bulk of those extra pounds was concentrated around their waists.

That wasn't where the bulk of their foe's army was concentrated.

In the past, the bulk of agricultural production was concentrated in a few limited areas.

The bulk of the work was concentrated on details in School No. 1 and also portraits.