其中有一块皮，它是那个牛的皮，但不是有牛背上的皮和牛脖子上的皮，背上皮

There is a piece of skin. It is the cow's skin, but it is not the cow's back and cow's neck. The back skin must be thicker and more durable after grinding, and then the neck skin must be thinner, and it must have A little bit small.

There is a piece of leather, it is the skin of the cow, but not the skin on the back of the cow and the skin on the neck of the cow, the skin of the back must be a little thicker and a little more durable, and then the skin on the neck must be a little thinner, it will certainly have a little small.

One of them is the skin of the cow, but it is not the skin on the back of the cow and the skin on the neck of the cow. The back epithelium must be a little thicker and wear a little longer. Then the skin on the neck must be a little thinner, and it will be a little smaller.<br>