"They are a continual source of interest," agreed Spock.

This, of course, was a continual source of surprise to Daniella.

His changing sexual identities are a continual source of problems.

She enjoyed her life very much and found in it a continual source of entertainment.

His son was a continual source of amusement and delight to him.

Dietary supplements, their ingredients, safety, and claims, are a continual source of controversy.

Despite being a continual source of controversy and many calls for its removal, it has existed on the site since that time.

Cars were also a continual source of competition.

If this respect is not forthcoming, it will be a continual source of misery.

They would be a real asset to this world, a continual source of cultural stimulation.