ultrasound
noun uk/ˈʌl.trə.saʊnd/ us/ˈʌl.trə.saʊnd/
[ U ]超声波（用于人体器官检查、潜艇导航等）
special sound waves used in such processes as examining organs inside the body and directing the route of submarines
They'll use ultrasound to monitor her ovaries. 他们将利用超声波监测她的卵巢。
ultrasound scanning/imaging 超声波扫描／成像
[ C ]超声波检查
an ultrasound scan