To work properly, all of the individual diaphragm elements would have to operate cleanly at the clock frequency.

Then he operated quickly and cleanly, sealing incisions as he made them.

A simple spark, when delivered at precisely the right moment, can mean the difference between a smooth running and powerful engine that operates cleanly and an engine that runs rough, lacks power and produces unnecessary emissions.

And to meet environmental laws for California, they added a data port to all cars, allowing inspectors to access the engine-control unit and assess whether the engine was operating cleanly.