Outside the windows on the lake side there was a very faint throbbing sound.

Then, as a low, throbbing sound began, the dead seemed to stir.

Over the throbbing sound, he said, "Right now, the hose is mostly full of our own atmosphere.

The throbbing sound around the library grew louder as we threw on our clothes.

The throbbing sound in my ears was the echo of jet engines.

It was a powerful, throbbing sound that seemed to penetrate to the very center of his head.

He heard the whisper of a sigh, and then a low, throbbing sound.

He seemed to be intently listening to some distant, throbbing sound.

He seemed to be listening for the throbbing sound again.

When the throbbing sounds had died, silence held deep sway.