Most of the fishes make sound by moving their muscles and bubbling, while mankind make sound by the vibration of vocal cords, a big differences between them.
大多数鱼类都依靠运动肌肉，吐出气泡来发出声音，这与人类依靠声带振动发出声音有很大区别。
"Orangutans, by comparison, had fewer" vibration regimes "- meaning they could get fewer tones from their vocal cords."
相较而言，红毛猩猩拥有更少一些的“震动体制”，即他们只能从他们的声带中发出更少的音调。
Tone: Tones sre pitch variations, which are caused by the differing rates of vibration of the vocal cords.
声调是由于声带振动的速率的不同而引起的音高变化。
Unvoiced sound: These are not produced by the vibration of vocal cords.
由嘴唇所发出的气音，并不牵汲声带的震动。
Unvoiced sound: These are not produced by the vibration of vocal cords.
由嘴唇所发出的气音，并不牵汲声带的震动。
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