ultrasound/ˈʌltrəsaund; `ʌltrəˌsaʊnd/ n[U]sound withan ultrasonic frequency; ultrasonic waves 超声（波） [attrib作定语]an ultrasound scan, eg to detect abnormality in a foetus 超声波扫描检查（如可用以检查胎儿是否畸形）.
牛津英汉双解词典