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surround sound

noun
🔊/səˈraʊnd saʊnd/
🔊/səˈraʊnd saʊnd/
[uncountable]
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  1. a system for reproducing sound using several speakers (= the pieces of equipment that the sound comes out of) placed around the person listening in order to produce a more realistic sound环绕音响系统；环绕立体声系统