But there was a constant exchange of messages between the two kings.

There is a constant exchange of energy in the form of heat radiation between the ground and the atmosphere.

But the constant exchange between familiar and new information also operates on a more individual basis.

The gunfire drew closer, but there was never anything like a constant exchange.

"There is a constant exchange of counterterrorism information and fragments," the official said.

Each may tackle different elements of a project, but the crucial conceptual work results from a constant exchange.

There was also the constant exchange of letters, seeds and plants with his overseas correspondents.

During these visits there was a constant exchange of goods and gifts.

There could be losses as well as gains from the constant exchange of men.

A constant exchange is facilitated by the use of English as a common working language.