In a few exceptional cases, a business might need to keep running a dual system for some reason.

He is not the first inventor with the idea that one computer should have dual systems.

Students who do not enter the "dual system" after the 10th grade usually remain in school for three more years.

The dual system was successful in both parts of the divided Germany.

The contrast between these two is a further reason for the popularity of dual systems.

At issue is a 1955 law that created a dual primary system.

Research rather suggested that there often seemed to be a dual political system of interests, action, and demands at the local level.

We must avoid creating dual systems that would do more harm than good.

Turning to the matter in hand, there is no doubt that everyone here wishes to have the dual system.

Despite a series of crises, this dual system survived until 1918.