One day, a cow, watching eating grass, ate grass every day, and her breast was a little swollen and painful. Then, she found that she could produce milk, and then she produced a large glass of milk herself.

One day, the same cow was eating grass and found that the grass was gone, but fortunately there was a large glass of milk. It drank milk.

Alas, such a good cow gave birth to such good milk and saved my life.