amplifier
柯林斯词典
1. N-COUNT An amplifier is an electronic device in a radio or stereo system that causes sounds or signals to get louder. 扩音器
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amplifier /ˈæmplɪˌfaɪə/ (amplifiers)
剑桥词典
- an electrical device that makes sounds louder
扩音器，扬声器 返回 amplifier