The system could be operating within 18 months, he said.

Ask your children's head for more information on how the system will operate at the school.

I don't think he knows much about how the system can operate.

"We need to look at how the system is operating."

The system may not operate as it is expected to.

The system is already operating in an area of about two square miles.

Scientists hope the system will operate for at least six years.

From the early 20th century until 1975, the system of mass education operated on the French model.

Now, most systems operate at up to 10x the frame rate.

Late today all systems at the center were operating normally.