The mockingbirds and the jays, engaged in their old feud for possession of the magnolia tree beneath her window, were bickering, the jays strident, acrimonious, the mockers sweet voiced and plaintive.
The late afternoon sky bloomed in the window for a moment like the blue honey of the Mediterranean—then the shrill voice of Mrs. McKee called me back into the room.
This means the patient can listen to music and can still hear the voice of the dentist or dental nurse, but they won't hear the high-pitched sound of the drill.
All I remember being taught was that bats make high-pitched sounds to echolocate as they fly around, but it sounds like there's a lot more to it than that.