Julian Clegg - Study suggests exposure to high-frequency sounds - from door sensors or public address systems - could make people feel ill. - 成人快手 Sounds
Julian Clegg - Study suggests exposure to high-frequency sounds - from door sensors or public address systems - could make people feel ill. - 成人快手 Sounds
Study suggests exposure to high-frequency sounds - from door sensors or public address systems - could make people feel ill.
University of Southampton Professor, Tim Leighton, calls for new protective guidelines
