名词
中文翻译：永久动力扬声器
同义词：
['permanent-powered speaker', 'permanent-powered loudspeaker']
例句：
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1. Thisspeaker is designed for use in outdoor environments where there is no power source.
这款扬声器设计用于户外环境，没有电源供应。
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2.The speaker was a popular choice among students who needed to listen to lectures on campus.
这款扬声器是学生在校园内听讲座时的首选。
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3. The speaker has a built-in microphone that allows it to be used as both a speaker and a microphone.
这款扬声器内置麦克风，可以同时作为扬声器和麦克风使用。