动物的发声Animal voice

    走进森林，可以听到鸟的自由歌唱；即使走近猪圈羊栏，被囚禁的猪羊，还是能自由发声。唯有人类的发声，必须严格控制，这就是人类高于动物的文明。

     Walking into the forest, you can hear the birds singing freely; even if they are close to the pig pens, the imprisoned pigs and sheep can still speak freely. Only human voices must be strictly controlled. This is the civilization of human beings above animals.