“ultrasonic echo”的概念、定义、翻译、参考文献-科学参考

单词	ultrasonic echo
释义	ultrasonic echo [¦ǝl·trǝ`sän·ik `ek·ō] ^ACOUSTICS An ultrasonic wave that has been reflected or otherwise returned with sufficient magnitude and time delay to be perceived in some manner as a wave distinct from that directly transmitted.
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