They needed the extra information to decipher the unfamiliar sounds.

Sometimes, on the rare late Friday afternoon, you might hear an unfamiliar sound in the background of my cell phone.

Charlie had no idea he could be so alert to the slightest unfamiliar sound.

She heard an unfamiliar sound and turned her head to see Andrew in the doorway.

It was a kind of silence, and unfamiliar sound would alert me.

But the boy repeated the rune again, taking time to form the unfamiliar and difficult sounds with care.

Its ears were up, sampling a universe of unfamiliar sounds.

I lay in the darkness for a long time after that, listening to the unfamiliar sounds of the old house.

She strained and heard nothing at first, then a faint, unfamiliar sound.

His quick ear had caught a faint but unfamiliar sound.