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回顾天安门广场地区声频系统的发展变迁,介绍声频系统为70周年纪念大会进行的改造方案,以及临时扩声系 统的设计方案.“,”In this paper, the development of audio system in Tiananmen square area was reviewed. Meanwhile, the author introduced the audio system transformation scheme and design of temporary amplification system to commemorate the 70th anniversary conference.