There are many disappointments constantly occurring, but these must happen in all sports.

So sabotage occurred constantly, and men were killed at their machines for attempting it.

Nevertheless, changes constantly occur as is shown by a cursory glance at the development of local government services in Britain.

He was premier during a period of great labour unrest with constantly occurring strikes.

Words like these occur constantly in historical writing.

Other forms of abuse may be constantly occurring, while physical abuse happens occasionally.

Biological and geological change has been constantly occurring on our planet since the time of its formation.

This behavior is involuntary and occurs constantly except for the brief stops due to diverted attention.

Cases of banditry, which local officials were forced to combat, occurred constantly in the countryside.

Rare individuals with specific talents occur constantly in any species, man included.