All three churches have a strong and healthy relationship between them which is constantly developing.

"We are constantly developing new strains of viruses and bacteria," they said.

The tourist business environment is constantly developing with an increasingly active tourism promotional system.

This field of social research was an issue, which Parsons constantly developed through elaboration and self-criticism.

So we're constantly developing new techniques and responses.

"We are constantly developing new promotional materials and new profiles," she said.

Egon constantly develops new and "genius" plans during his stays in prison.

A longstanding belief is that cancer cells constantly develop and are held in check by a healthy immune system.

During its history, the station has suffered severe setbacks, although the city has been constantly developing.

It was a script that developed constantly, from the rehearsal period to improvisations on the set with the kids every day.