但与人耳可听见的声音相比，鲸鱼更‘擅长’用超声波交流，尤其是在水下。
But whales communicate better through ultrasonic sounds than through human-audible sounds, especially underwater, "he explained."
潜水员应该都随身携带一个能在水下发出清晰可听见的大声音的东西。
Divers should carry an easily activated noise maker that's clearly heard underwater.
AUX与声频信号(T ')一起传送，前者不能与后者分离，且在后者重现期间该AUX是不可听见的，声音重现质量不会恶化。
Along with an audio signal (t), AUX is intended to be transmitted which cannot be separated from the audio signal, is inaudible on reproduction and does not impair sound reproduction quality.
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