ultrasound
🇺🇸
/ˈʌltrəsaʊnd/
🇬🇧
/ˈʌltrəsaʊnd/
A sound with a frequency higher than the upper audible limit of human hearing.
Dolphins use ultrasound to communicate underwater.
海豚使用超声波在水下进行交流。
A medical imaging technique that uses high-frequency sound waves to create images of the inside of the body.
The doctor used an ultrasound to check the baby's development in the womb.
医生使用超声波检查胎儿在子宫内的发展情况。