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ultrasound waves emission /ˈʌlnɑː ˈnɜːv/ n

中文：超声波发射

中文 · 超声波发射Español · emisión de ondas ultrasónicasFrançais · émission d’ultrasons
Meaning：Production of very high-frequency sound vibrations whose echo is captured and analyzed.
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Sonar detection

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