| 单词 | ultrasound |
| 释义 | ultrasound /ul"treuh sownd'/, n. 1. Physics. sound with a frequency greater than 20,000 Hz, approximately the upper limit of human hearing. 2. Med. the application of ultrasonic waves to therapy or diagnostics, as in deep-heat treatment of a joint or imaging of internal structures. Cf. ultrasonography. [1920-25; ULTRA- + SOUND1] |
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