The five-river crab is widely used. "Tiangong Kaiwu" has written that the shell of the crab can be used to make paint, the color is fresh and long-lasting, and the ancient painters relied on it a lot. The crab meat is delicious, and it is a delicacy on the table, or steamed or boiled, the aroma is overflowing, and the food is fragrant to the mouth and teeth, and the world loves its taste. And the crab can also be used in medicine. Its cold nature, it has the effect of clearing heat and dissipating blood stasis, continuing tendons and bones, and it can treat bruises, tendons and fractures. When used as medicine, you should follow the doctor's advice, and do not do it yourself. In addition, the claws and feet of the crab are tough and resilient. Although the ancients made it with utensils, although the shape and structure are simple, it is very practical, and it is also beneficial for daily labor. Wuhe Crab is useful in pigments, diet, medicine, and utensils. It is a godsend and has contributed to many aspects of people's livelihood.

The Five Rivers Worm is a unique thing between heaven and earth. Its physical properties are quite unique.
The first word about its shape. The Five Rivers Worm has a slender body shape, slightly cylindrical shape, and its body surface is warm and shiny, like a thin glaze. Its color is green or brown, hidden in the soil, and blends with the soil color. If you don't look carefully, it is difficult to feel it.
Second, on its nature. Its body is soft and tough, although it is gently folded by external force, it is not easy to break. To touch it with your fingers, it is slippery but not greasy, just like being wrapped in silk.
Furthermore, the Five Rivers Worm has the ability to absorb moisture. Placed in a slightly damp place, it can absorb water vapor from the surrounding environment and moisturize its body. If it is in a dry place, it can also slow down the loss of water by the delicate mechanism in the body to survive.
In addition, Wuhe worms travel freely through the soil. Wherever they pass, the soil is loose and the qi is connected. The cover can moisturize the soil and condense particles because of the mucus secreted by its body, making the soil more loose and fertile, which is of great benefit to farming and gardening.
And Wuhe worms are sensitive to the environment. Changes in temperature, humidity, and soil pH can all cause their reactions. In case of discomfort, quickly look for other places, seek advantages and avoid disadvantages, and show wisdom.
The physical properties of the Five Rivers Worm, whether in shape, quality, or energy, are all wonders of creation, and are indispensable to the natural ecology. It needs to be carefully investigated by the world to understand its more mysteries.

In the case of five rivers, its transformation property is very special.
It is not as smooth as gold, but it also has its own characteristics. When it melts in the event of fire, it can be turned into a kind of utensil. Its melting cost is high, and it cannot be melted into a liquid without a fierce fire.
In the air, if it takes a long time, it will be born. This kind of thing is the interaction of water vapor, carbon dioxide and other things in the air. Its green color can be used in the natural environment.
In addition, it can be used to create a multi-acid material. In case of acid, such as sulfuric acid and nitric acid, the reaction is especially strong, and it can be produced and dissolved in it, and the solution is dissolved. However, when it is weak, the reaction is not as strong as acid, but it also has subtle transformation.
And in terms of performance, it often has good performance, and it is often used as a raw material. This is because of the atom quality of its parts, making it easy to flow.
Of course, the five rivers are rich in chemical properties, or they are generated by the interaction of the environment, or they are anti-acid and have good performance. It is a special gold.

"Tian Gong Kaiwu" contains that where a bell is cast, the higher one is made of copper, and the lower one is made of iron. As for the synthesis of the Five Rivers, there are also various wonderful methods.
First, copper is the main one, supplemented by other materials. Copper is warm and moist, its quality is tough, and it can make the sound of the bell melodious. It can be supplemented with tin, which can increase the hardness of copper and make the bell sound clear. Fusion in an appropriate proportion, such as 70% copper and 30% tin, carefully cast, can make a good tool.
Second, iron can also be used as a base. Iron is strong, but pure iron casts bells, and the sound is easy to be turbid. Can be mixed with copper, or a little silver and lead can be infiltrated into iron. Silver can make the sound pure, lead can make the sound calm. Such as iron 60%, copper 30%, silver, lead a total of 10%, after many calcination, tempering, so that all materials into one.
Third, when smelting, the heat is the key. Fire is easy to melt, but if it is too strong, the material will be damaged. You need to slowly heat up and observe its color change. When the copper and iron are all in a fluid state and blend seamlessly, you can pour them into the fan. Fan's production also needs to be exquisite, with clay, sand and other molds, so that the inner wall is smooth and flawless, so that the sound quality of the bell can be pure.
Fourth, the finishing after casting cannot be ignored. When the bell is cooled and formed, it is necessary to carefully inspect its surface to remove its burrs and flaws. Carefully polish with a file and a grindstone to smooth the bell body. And tap it all over the bell, listen to its tone, if there is any dissonance, then adjust it until the rhyme is harmonious and melodious.
The synthesis of Five Rivers, all techniques complement each other, and all require the exquisite skills and careful operation of craftsmen to achieve a good product.

I look at your words, but I ask what are the precautions in the use of the five-baht money. The five-baht money was minted in the early fifth year of Emperor Wu of Han Yuanxing, and was abolished in the fourth year of Tang Wude. It has been used for more than 700 years. It is an important currency in ancient China. During its use, all kinds of matters must be observed.
First, the distinction between authenticity and authenticity. The five-baht money has been in circulation for a long time, and the wind of private casting is also prosperous. Adversaries often cast fake money with miscellaneous copper, evil lead, etc., in order to make a good profit. Users should carefully distinguish the texture, shape and text of the money. Real five-baht money is of fine copper quality, regular shape and clear text. If the money is rough, the text is vague, and the texture is light and inferior, it is mostly fake money and cannot be used.
Second, wear and tear and weight reduction. As time goes by, the five-baht money has been traded countless times, and wear and tear is inevitable. However, there are also lawbreakers who deliberately file and cut edges to reduce the weight of the money in order to obtain more copper materials. Users should carefully consider the value of such weight-reduced money. Those who lose too much weight, or affect the fairness of the transaction, need to negotiate with other parties to set the price.
Third, regional differences. Although the five-baht money is the national currency, the shape, weight and fineness of the money are slightly different in different regions, or due to economic conditions and different coinage processes. When trading across regions, pay attention to the differences in the five-baht money in different places to avoid disputes.
Fourth, government decrees. The imperial court often issues administrative orders on the use, casting, and exchange of five-baht money due to economic, political, and other reasons. Users should be informed in a timely manner and abide by such decrees. If the imperial court bans certain five-baht money or adjusts the exchange rate, they must act in accordance with the order, otherwise they may lead to disaster.
The use of five-baht money is related to livelihood transactions and should not be careless. Only by distinguishing authenticity, detecting wear and tear, recognizing regional differences, and obeying government decrees can transactions be smooth and goods and goods are stable.