ultrasonic
柯林斯詞典
1. ADJ Ultrasonic sounds have very high frequencies, which human beings cannot hear. 超聲波的[usu ADJ n]
返回 ultrasonic
ultrasonic /??ltr??s?n?k/
劍橋詞典
- Ultrasonic sound is too high for people to hear .
（聲音）超聲的 返回 ultrasonic
（聲音）超聲的 返回 ultrasonic