ultrasound

n. /ˈʌltrəsaʊnd/ B2

超声波；超声检查

Sound waves with frequencies above the limit of human hearing.

仙境例句

Some bats call in ultrasound, a sound too high for Alice or her sister to hear.

有些蝙蝠用超声波叫，那声音太高了，爱丽丝和姐姐都听不见。