So it's which of these partials are sounding within each of these instruments, and the physical properties of each of these instruments are different.

所以是因为每种乐器发出的泛音不同,每种乐器的物理性质,都是不同的

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They have not evolved to tolerate some of the man made sounds that have very unusual and unnatural physical characteristics. These sounds are for example explosives, industrial noise, musical instruments, power tools, and headphones.

还没有进化到能忍受,某些怪异，超出常规的人为声响,如爆炸，工业噪音,乐器，电动工具和耳机等等。

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