They were wide and low, separated so that their centers formed a dais.

A possible center of low pressure, attached to a cold front extending southward, had formed within the larger system and moved toward the east.

The centers of the in- and excircles form an orthocentric system.

A new center formed to the south, which complicated the system's development.

Intermediate level resource and national centers should form part of an integrated system.

Indeed, the powerful black center formed a perfect barrier against attack.

These urban centers formed out of a realization that cooperation was necessary for survival.

There was a citadel, whose center of a building formed a large courtyard.

The center forms the backbone of nanotechnology research in the university.

The following morning, a second flight reported that a center had formed, and the disturbance was designated a tropical depression.