sound 4 [i ]     (순위: 50228 - 대졸 수준)   뜻  명) 해협, 좁은 해협, 하구, 후미, 작은 만, 부레 Mean  Vibrations transmitted through an elastic solid or a liquid or gas, with frequencies in the approximate range of 20 to 20,000 hertz, capable of being detected by human organs of hearing.