牲畜有牙口,人也有,牲畜有尾巴,人却没有。有尾巴的牲畜,与没有尾巴的人无法用语言沟通,只好借助自己的长处,用尾巴的摆动来表示它们对人的服帖、敬重或是恐惧。牲畜以外,鸡犬鸭鹅鱼虾鳖蛇通常也用摆尾的方式表情达意。然而,人们有时候关注的不是它们的尾巴,而是它们的牙口。 Livestock has teeth, people have, livestock have tails, but people do not. Tail-worthy animals, unable to communicate with those without a tail, can only use their own strengths to express their fear of mankind by using the swing of their tail. Outside of livestock, chickens, duck and goose fish, turtle snakes, also express their emotions in the form of pendulums. However, people sometimes focus not on their tails, but on their mouths.