“ultrasound”的概念、定义、翻译、参考文献-科学参考

单词	ultrasound
释义	ultrasound [`ǝl·trǝ´sau̇nd] ^ACOUSTICS Sound with a frequency above about 20,000 Hz, the upper limit of human hearing.
随便看	rimless rimmed rimmed kettle rimmed solution pool rimmed steel rimming wall rimpylite rim ridge rimrock rimstone rim syncline rincon rind rinderpest R indicator ring ring A ring-and-ball test ring-and-bead sight ring-and-circle shear ring-around ring B ringbolt ring bus ring C

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