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sonic barrier▼noun[UK: ˈsɒ.nɪk ˈbæ.riə(r)] [US: ˈsɑː.nɪk ˈbæ.riər]
sound barrier▼noun[UK: ˈsaʊnd ˈbæ.riə(r)] [US: ˈsaʊnd ˈbæ.riər]
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