Existing predominantly, in the Very Low frequency part of the radio spectrum that corresponds with the audio frequency range, we can experience this activity as audible sound.
尽管这种活动主要存在于无线电声音频率分区的超低频区域，我们还是能够通过听觉来捕捉到它。
Existing predominantly, in the Very Low frequency part of the radio spectrum that corresponds with the audio frequency range, we can experience this activity as audible sound.
尽管这种活动主要存在于无线电声音频率分区的超低频区域，我们还是能够通过听觉来捕捉到它。
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