名词
中文翻译：回音电路
同义词：
['echo circuit', 'feedback circuit', 'echo return circuit例句：1. The speaker-back circuit is used to amplify the sound of speech.（扬声器回音电路用于放大语音声音。）2. The engineer designed the speaker-back circuit to improve the clarity of the audio signal.（工程师设计了扬声器回音电路，以改善音频信号的清晰度。）']
例句：
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1. The speaker-back circuit is used to amplify the sound of speech.
扬声器回音电路用于放大语音声音。
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2. The engineer designed the speaker-back circuit to improve the clarity of the audio signal.
工程师设计了扬声器回音电路，以改善音频信号的清晰度。
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3.The speaker-back circuit was responsible for preventing feedback loops in the system.
扬声器回音电路负责防止系统中的反馈回路。