In the silence, Amanda could hear the refrigerator humming steadily.

The food dispensers set into the walls of the crew mess hummed steadily.

Taking a deep breath, Eydryth hummed steadily, and they started up the long, rocky trail.

Picking up Monso's lead once again, humming steadily, the songsmith went on.

The motor rumbled when she turned the ignition key, then hummed steadily.

He had seen the transformer boxes outside the large rooms with their long rows of steadily humming machines.

Christine tapped rapidly at the keyboard and the computer hummed steadily behind its metal paneling.

To his left, the compressors hummed steadily, keeping the employees and the equipment inside the building within the comfort zone.

The plant whispered and then hummed softly and steadily.

She had taken a seat three-quarters of the way back in the bus, and the diesel engine hummed steadily not far behind her.