There were usually two others, but they varied during the years.

The crowd varies during the day from 30 people to 100.

It changes in response to the different things you vary during the experiment.

Temperatures vary during the year from between 9 and 23C.

In most ecosystems, the conditions vary during the day and from one season to the next.

Usage also varied, in ways one would expect, during each day.

District magnitude can sometimes vary within the same system during an election.

Temperature also varies with the change of seasons during each year.

The business needs will vary greatly during different periods of time.

The number of cards dealt to each player varies during the game.