ultrasonic
[形容词]
involving or relating to sound waves with frequencies higher than the upper limit of human hearing

超声的, 超声波的
stereo
[形容词]
relating to a sound system that uses two or more channels to create a sense of space and depth in audio playback

立体声的, 声道的
piercing
[形容词]
(of sound) extremely high-pitched or intense that seems to cut through other sounds

刺耳的, 尖锐的

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