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1. This public-address amplifier is very easy to use.
这个公共广播放大器使用起来非常方便。
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2. The public-address amplifier was used in the broadcasting station.
在广播电台，公共广播放大器被使用。
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3. The public-address amplifier is essential for effective communication.
公共广播放大器对于有效的沟通至关重要。