Each theory can be used to help understand a particular illness.

The theory can be used to account for the gas laws described above.

Fairly accurate results can then be found by using potential theory.

Critical theory is also widely used in peace and conflict studies.

The theory was hijacked and has been used in a class war ever since.

To use scientific theories, they must be applied to the specific situation in hand.

Too bad we can't use your theory to our advantage.

This theory was used to give names to the three parts of the caves.

Therefore, economic theory can often be used to study these virtual worlds.

His method is all fact - he uses theory only as a follow-up.