A range of frequencies, usually from 5 hertz to 20,000 hertz, characteristic of signals audible to the normal human ear.是什么意思_A range of frequencies, usually from 5 hertz to 20,000 hertz, characteristic of signals audible to the normal human ear.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句