He could hear the hum of it beyond the walls.

Somewhere he could hear the hum of a computer that hadn't been turned off.

Over the radio, they heard the hum of the bike.

There was no longer to be heard the hum of the others.

She heard the low hum of a computer coming from inside.

Through the opened window above him he could hear the hum of voices.

To my right, I hear the hum of the automatic ball return.

In the background, I hear the hum of two people talking.

Ahead he could hear the hum of the crowd in the square.

Sister heard the low hum of another fly as it passed her head.