During the growing season, chlorophyll is replaced constantly in the leaves.

The teeth of reptiles are replaced constantly during their life.

The crudely built facilities did not last long and were constantly replaced.

Without bearings, we would be constantly replacing parts that wore out from friction.

Evaporation of sweat from the skin is the body's main cooling system, and this lost water must be constantly replaced.

You can either constantly replace the fragile weapons, or head to a workbench to repair them.

The water has a finite thermal mass, whereas the air it flies through is constantly replaced.

Not only is it rare, but it must be constantly replaced.

Due to the blood brain barrier, it would be fairly difficult for the body to constantly replace microglia.

She constantly replaces parts, panels, internal components, switching them back and forth.