Those who cough and spit are important to human physiology and behavior.
As far as physiology is concerned, cough and saliva are a sign of smooth organs such as the lung system. The lungs are responsible for breathing in the air, and then towards the whole vein. If the lung qi is declared to drop and lose the division, and the evil energy disturbs it, it is easy to cough and spit. For example, "Lingchu Meridians" says: "The veins of the lungs and hands are too yin... If you move, you will be sick. The lungs are full, swollen and panting and coughing, and it is painful in the absence of a basin, and even when you have both hands, this is the brachial syndromes. Those who are sick of the main lungs, cough, asthma and thirst, and the chest is full." It can be seen that the lesions of The kidney is the root of qi, and the lungs and kidneys are related. The kidney cannot accept qi, or it may cause the disease of coughing and saliva. Therefore, coughing and saliva is related to the harmony of the viscera, and observing its state can reveal the health of the viscera.
In the meaning of doing things, coughing and saliva is also unusual. In ancient times, there was a saying "coughing and saliva into beads", which was used as a metaphor for people to speak precious, and their words were as delicate as pearls and jade. This is the wisdom and talent of people. The words are the scriptures, and the feet are the law. Every word has profound meaning, just like the pearls written to disks. Such as a person in the Wei and Jin Dynasties, when talking, coughing and saliva are vivid, with exquisite theories and profound thoughts, leading the fashion of the moment. Furthermore In case of evil, anorexia, or coughing to show disdain; in case of confidants and good words, they will face each other with their faces, and coughing and spitting also contains friendliness.
Although coughing and spitting is a normal physiological action, it has significance that cannot be ignored in the observation of human health and the behavior of others. In fact, it is seen in the smallest places.

< Br >
First of all, saliva is not solid, like water, but has the nature of flow. Saliva is not solid, like water and has a flow. It can be shaped and shaped. It comes out of the population, depending on the force and the outside world. It may be sticky, or dripping, and gravity. It is attached to objects and fixed. This is the common nature of flow.
Secondary stickiness. Saliva is not as smooth as water, but slightly sticky. It adheres to objects and is not easy to fall off. This stickiness is caused by the protein molecules contained in saliva, which make saliva have a certain sticky effect. If it is stuck on the wall, it can be attached to it, and it will not slip off; if it is stuck on the wall, it will become sticky.
Furthermore, there is a surface force. Droplets of saliva, when dried by external forces, often form a spherical shape. Due to the surface force, the surface molecules of the liquid are subject to the attractive force of the partons, and the surface is minimized in the direction of the saliva droplets, while the spherical shape is the smallest in the same matter. Therefore, the saliva droplets are more spherical, which is the result of the surface force.
And density. The density of saliva is slightly higher than that of water, because it contains polysoluble molecules, such as hydrolysis, enzymes, etc. This makes the water that comes out of it sink slightly at the same speed, and the water that falls to the ground also has a different shape due to the density.
In addition, saliva has a certain quality. If it comes out of the object, it will not be stiff and scattered. To a certain extent, it can be slightly shaped due to the quality. If it is on a soft cloth, the initial surface of the cloth will be slightly extended due to the quality, rather than immediately penetrating into the cloth.

Those who spit are also in the mouth. It is also common in people, and it is not noticed, but it contains a lot of chemical properties, which can be investigated.
There are many enzymes in saliva, one of which is the saliva powder enzyme. This enzyme can dissolve the powder and bud sugar, just like the carved jade of a craftsman. When food is in the mouth, chewing is mixed with saliva, and the saliva powder enzyme starts its work. The powder in the food is decomposed once, making it easier for us to absorb. And the activity of this enzyme, which is dense in the oral environment, can be affected by the degree and acidity. The appropriate degree, like that of people, can promote its efficient operation; if the degree is high or low, the activity is weak, such as being stuck in the mud, it can be used to develop its ability.
In addition to enzymes, saliva still contains a variety of nutrients. Among them, nutrients, chlorine, and other substances, maintain the transparent balance of oral fluid, so that the oral cells can be safe. Such as embankment to prevent water, so as to reduce the field. And the like also have important help in the reduction of teeth. If the content is inappropriate, the tooth may be damaged easily, such as the loss of stone in the wall, and it will be fixed for a long time.
In addition, saliva contains immunoglobulins. This person is one part of the immune protection, which can be combined with foreign bacteria and other antigens, such as the capture of the invaders, so that the bacteria can grow and wreak havoc in the mouth, and protect the safety of the mouth. However, its content is also uncertain. If a person encounters a disease or a special disease, the amount of immunoglobulin may vary, depending on the situation.
In addition, saliva contains mucoprotein. This protein can make saliva sticky, which can be used for chewing and swallowing food, and can slide food, making it profitable to go down, such as a boat traveling in water, and pass through the barrier. And mucoprotein can adhere to the surface of the oral mucosa, forming a protective membrane, which is like a shield of the body, and less external stimulation of the mucosa.
Because of this, saliva is a microscopic substance, but its chemical properties are many, and it plays an important role in human digestion, immunity, oral hygiene, etc., and cannot be ignored because of its usual effects.

Alas! It is necessary to be careful when the phlegm is in the process of being preserved and damaged. It is advisable to avoid this in the middle, and it should be investigated carefully.
First of all, in the state of being preserved, it is difficult to seek and dry. If it is in a damp place, phlegm is easy to breed bacteria and microorganisms, causing it to rot, not only losing its original effectiveness, but also producing harmful things and endangering other things. And it should be kept in a tight place to prevent the mixture of particles and substances from mixing in and fouling it.
If the phlegm is outside, it will not pollute the surroundings, or cause the disease of life and involve others. Furthermore, the quality of the phlegm should also be appropriate. High, phlegm is susceptible to corrosion and perishable; low, or cause it to coagulate, affecting its effectiveness.
In addition, the operator must maintain the health of the phlegm. When receiving phlegm, it is advisable to use tools, such as gloves and masks, to prevent their germs from invading. Things, add cleaning and de-staining.
And if it is not stored, it should not be ignored. The beginning, the end, and the situation, so that it can be traced for follow-up investigation. If there is a constant, it can be traced back to the source and correct.
It is necessary for phlegm to exist and survive, and it is generally necessary. A little carelessness can lead to illness. It is the right way to do things in order to keep them safe.

< Br >
First, take bamboo as the tube. Choose the best bamboo, the bamboo joints need to be straight and tough. Choose bamboo in the mountains, and cut it when it becomes bamboo and is not old. Remove its green skin and leave the inner skin strong, and cut it into a suitable length. This is the tube body. Then use a sharp blade at one end of the tube, cut it into four pieces, sharpen its head, bend it and bind it into the shape of a nib, which is the foundation of the ancient tube.
Second, use wood as the tube. Take high-quality wood, such as sandalwood, catalpa wood, etc., such wood has fine texture and is not easy to deform. The wood is first sawn into strips, carefully carved, so that its thickness is appropriate, and hollow to hold ink. The head treatment is similar to that of bamboo pipes, and it also needs to be sharpened, bent, and fixed to form a writing part dipped in ink.
Third, there are also those who use animal bones as tubes. It is better to choose the strong bones of the beast, beef bones and deer bones. Wash the bones and pick the meat first, then use abrasives to polish them smoothly, and drill them through, so that they can be a channel for ink flow. The head of the bone tube is carefully processed, or engraved or cut, so that it can store ink and write smoothly.
There is also a method of metal casting pipes. Copper, tin and other metals are molded to make a tube body. The metal tube is sturdy and durable, but the production process is complicated, and superb casting skills are required. After casting, it is polished and polished, and the head treatment is more fine. It strives for smooth nib and free writing.
The method of pipe making has its own advantages. Bamboo tube is simple and convenient to obtain materials; Wood tube is elegant and warm in texture; Bone tube is tough and unique; Metal tube is sturdy and highlights the craftsmanship. All are the crystallization of the wisdom of the ancients, adding a lot of color to the wonderful tool of writing on the tetany tube.