“ultrasonic”的概念、定义、翻译、参考文献-科学参考

单词	ultrasonic
释义	ultrasonic [¦ǝl·trǝ`sän·ik] ^ACOUSTICS Pertaining to signals, equipment, or phenomena involving frequencies just above the range of human hearing, hence above about 20,000 hertz. Also known as supersonic (deprecated usage).
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