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TOEFL BNC: 25704 COCA: 21711
ultrasonic
adjective science /ˌʌltrəˈsɒnɪk/
  1. ultrasonic sounds are sounds that humans cannot hear because they have very high frequencies 超声的;超声波的
     Synonyms and related words
    Relating to sound: above, acoustic, acoustics...

derived word

ultrasonically

/ˌʌltrəˈsɒnɪkli/ adverb
 Synonyms and related words
Relating to sound: above, acoustic, acoustics...

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