What are the three stages of severe cold?

The three stages of a bad cold are: first, the chicken begins to eat milk, second, the bird is seriously ill, and third, the water moistens the abdomen. The third period of great cold is the sum of the typical characteristics of animal reaction and natural change during the great cold season. "Yi Zhou Shu Shi Xun Jie" said: "It's cold, and chickens begin to suck. On the fifth day, the bird was very ill. And five days Shui Ze belly strong ". This means that when the solar terms are severe, hens who have rested in winter will start laying eggs and can hatch chicks. Five days later, the falcon will hover in the air and hunt more fiercely. In five days, even the middle of the pond will form a hard layer of ice.

"Chickens begin to nurse" means that chickens begin to nurse their offspring. Chickens need a certain amount of sunshine to lay eggs. Before the great cold solar terms, there was little sunshine, so eggs were rarely laid. Because the hen's ovary needs ultraviolet stimulation, the light is less, and the vitamins needed for laying eggs will also be reduced. At the beginning of the solar term, when the light is enhanced, hens can lay eggs.

Another name of "Bird" is "Falcon", which is a fierce bird. This bird can cross the Pacific Ocean with a twig in its mouth. "Li Ji" means fierce and fast. The reason why bird recruitment becomes fierce and fast is that it is colder in cold season, and he has to grab more food to resist the cold.

"Shui Ze" refers to the lake, and "belly" refers to the center of the lake. "Firm" means firm. In the cold season, the ice on the lake will freeze in the middle of the lake, and the whole ice surface will become very solid.