The design of such a speaker circuit can solve the conflict between no-honking of citys in reality and the inherent speaker sound excessive or insufficient, and with good practical significance.

设计此种喇叭电路，能够很好的解决现实生活中城市禁鸣和固有喇叭音量过大和不足的矛盾，具有很好的实际意义。

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With the rapid expansion of city scale and the excessive concentration of population, the sound urban disaster prevention system has become a necessary arduous task.

随着城市规模的急速扩大和人口的过度集中，健全城市防灾系统已成为一项不容忽视的艰巨任务。

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