These nightmares recurred constantly, and Nightwolf came to recognize them as a warning.

In all experiments on animals, one problem that constantly recurs is how to keep the brain cells alive, since they die rapidly without oxygen.

They merely tolerated what, to them, must be a constantly recurring psychotic condition.

That dead man gives me more emotions than all the living men I ever coquetted with; he constantly recurs to my mind.

Those words of Mrs. Strong's were constantly recurring to me, at this time; were almost always present to my mind.

The last phrase recurred constantly, like a refrain.

But herein lies a paradox that would constantly recur in the history of fundamentalism.

But the reflection constantly recurred to me that each suggestion, to be of real value to science, would require years of work.

The current buzzword, flexicurity, recurs constantly in the report.

It was a surprise to find that Japanese technology had not kept pace with events that constantly recur in those areas.