These people operate at a very high level of violence.

Many of the factors operating at a national level have an international dimension.

"The money would allow us to operate at a higher level."

"I have always operated at two levels, a personal level and a political one," he explained.

They are more community oriented and operate at a local, rather than a national, level.

Or are they operating at a lower level, which has hidden long-term costs for our society?

The club was simply not operating at a viable financial level.

In the early 80's, he began operating at a different level.

He also said that the company's plants were operating at a high level.

European states clearly operate at a very high level in research projects.