N a note produced by a bell when struck, lying an octave or (in many English bells) a sixth or seventh below the strike tone (钟敲响时的)嗡嗡声 (Also called (esp Brit) hum note)
N（名词） a note produced by a bell when struck, lying an octave or (in many English bells) a sixth or seventh below the strike tone (钟敲响时的)嗡嗡声 (Also called (esp Brit) hum note)