它始终与乐音（clang）相联系，这种乐音是音调感觉（tone-sensation）的特色。我们从两者中区别出噪音（noise），它是一种声音印象（sound-impression），其中音高或者只能被不确定地感知到，或者一点...
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你可以用感觉去抓住注意力。明亮的颜色、大字体、“哔哔”声或者是一些音调都能抓住注意力。
You can use the senses to grab attention. Bright colors, large fonts, beeps, and tones will capture attention.
尤其要避免用尖锐拔高的音调讲话，令人感觉你在卖弄本事或争论。
We should use a moderate tone of voice, and avoid speaking in a sharp, high-pitched voice, which gives people the feeling that we are showing off or arguing.
声波的频率就是感觉的音调，是单位时间通过定点的压缩数目。
The frequency of a sound wave, perceived as pitch, is the number of compressions that pass a fixed point per unit time.
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