/ˈʌltrəsaʊnd ||; ˈʌltrəˌsaυnd/noun1 [U] sound that is higher than human beings can hear 超声,超音波(高于人听觉范围的声音)
2 [U] [C] a medical process that produces an image of what is inside your body 超声波检查;超音波检查: Ultrasound showed she was expecting twins. 超声波检查显示她怀着双胞胎。