The other is that Professor Wilson comes back in a day or two, and his presence would act as a constraint upon her.

The presence of insulin in the bloodstream acts somehow to lower the blood glucose level.

His advisers hope that his presence would act as a catalyst for the southern tribes.

The presence of this risk acted as a perverse incentive for the market not to meet the obligation.

"We cannot say that Gorbachev pushed him out, but his presence acted as a catalyst."

The presence of the shelves acts as "brakes" for the glaciers.

This presence of asymmetrical activity acts as a major aid in identifying the subject's imagined action.

The fact is that the man's mere presence acted as a powerful stimulant.

His strong presence acts as the centripetal force holding it all together.

The presence of a physical barrier also acted as a legal one.