So if you're standing in front of the ultrasonic sound wave, you can hear the sound.
So if you're standing in front of the ultrasonic sound wave, you can hear the sound.
所以如果你站在超音速声波的前面，你能听到声音。
So if you're standing in front of the ultrasonic sound wave, you can hear the sound.
所以如果你站在超音速声波的前面，你能听到声音。