In fact, the system may prove particularly useful on the ground, and not just for planes.

For one thing, the system has not yet proved itself in a dense urban area with many customers.

The system proved popular enough to be sold to other brewing companies.

A formal system (such as a computer program) cannot prove all true statements.

With that method the whole system proved to be very unpredictable.

The system proved so successful that it continued in service until the late 1980s.

Thus, a woman is permitted to die because the system could not prove that she wanted to live.

One way or another, we must try to ensure that the system proves effective.

His development was not alone in the field however, and other systems were proving more popular.

The sound system in the Chamber has proved less acceptable.