The other type operates on the same principle as an electrocardiogram.

Their group operates on the principle of doing the most you can with what you have.

But all still operate on the basic principle of keeping something warm over a low flame.

All operate on the simple principle that muscles must work against resistance to become strong.

This national service system operates on the principle of subsidiarity.

These ears, if that is what they are, must operate on the same principle as the visitors themselves.

All of the Tower stores operate on the same principle.

The organization operates on the principle that the most important thing for its participants to learn is how to build a life in society.

He operated on the principle that you made your own luck.

"We are going to operate on the principle that all kids can learn."