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ultrasonic wave▼◼◼◼noun
supersonic▼noun[UK: ˌsuː.pə.ˈsɒ.nɪk] [US: ˌsuː.pər.ˈsɑː.nɪk]
ultrasonic waves▼◼◼◼noun
supersonics▼noun[UK: ˌsjuːpəˈsɒnɪks ] [US: ˌsupərˈsɑnɪks ]
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