The principal mechanism for evolution is natural selection among diverse populations.

So this equilibrium is the principal mechanism for maintaining sea water P H.

This is a principal mechanism of heart failure.

"If the meeting goes well, we will continue to use the contact group as the principal mechanism," he said.

The principal mechanism of the settlement was the convergence between rationalism and historicism in law.

Subdivision of land is the principal mechanism by which communities are developed.

The magic also lies in the core of the planet's advanced technology, serving both as the power source and/or the principal mechanism behind its operation.

This is the principal mechanism in the collection of submicrometre dust particles.

Thermal radiation is one of the principal mechanisms of heat transfer.

Unfortunately, the principal international mechanism for reassuring others about the benign intent behind a nation's biotechnology research has been rejected by the Bush administration.