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During the Three Kingdoms period, Cao Cao set the Central Plains in the north, so he mobilized his military forces to crusade against Xiliang and killed the leader Ma Su. Ma Chao, son of Ma Sui, was a famous Iliad in the Three Kingdoms period. He vowed to avenge his father, so he personally led Ma's troops to confront the troops stationed in Weibei (near Weihe River in the south-central loess plateau). Cao Cao led troops from a distance to confront Wei Shui and Ma Chao. Because of the long distance and unstable camp, it was repeatedly defeated by Ma Chao's Xiliang Army, and the troops suffered heavy losses. In order to save strength and guard against repeated attacks by Ma Chao, Cao Cao ordered Cao Jun to take sand from Weihe River to build a camp. However, due to the coarse sand grains and repeated collapse, Cao Cao was worried and worried. At this time, a local hermit asked to see Cao Cao and put forward a good plan to retreat from Ma Chao. He said: "The Weihe River is overcast these days, and the north wind will blow at night. With the north wind, it will be very cold. When the wind blows, let the soldiers carry soil and splash water until dawn. At dawn, a solid ice city will be built. " Cao clapped his hands and followed the plan, so he made the soldiers lift the soil and pour water on it, and overnight, a white "ice city" camp was built. The next day, Ma Chao led his troops to attack the camp again. Ma Chao and his men came to the "ice city" and were shocked. The ice city is steep and smooth, and the west cool soldiers can't attack it for a long time, and the losses are quite serious. The morale of the officers and men was low and the morale of the army began to waver. At this time, Cao Jun, who was waiting in the "Ice City", rushed out of the camp and defeated Ma Chao's Xiliang Army in one fell swoop, finally winning. So, how did the sudden cold weather come from? In fact, the reason is very simple, because it is the cold front weather phenomenon in our teaching. The season of Cao Cao's expedition to the west happened to be the early winter of October in the lunar calendar. At this time, bad cold front weather often occurs in most parts of northern China. Located in the Weishui area of the Loess Plateau, the second step of China's topography, whenever a cold front crosses the border, the warm and humid air mass from the south is forced to rise, and the high terrain intensifies the intensity of cold air. Therefore, when the warm and humid air mass rises, it will cause overcast clouds, increase the pressure gradient, appear windy weather dominated by the north wind, and the temperature will drop rapidly. After the cold front crossed the border, the area was occupied by cold air masses. Its high terrain makes the temperature drop further and the weather becomes freezing. Under such meteorological and weather conditions, it is easy to freeze. Cao Cao listened to the hermit's good strategy, took advantage of the change of cold front weather, transported earth and poured water to build an ice castle wall, which saved his strength, stabilized the morale of the army, inspired the morale of the soldiers and defeated Xiliang Ma Chao in one fell swoop. The distress of the island guards The Xisha Islands in the South China Sea are the sacred and inalienable territory of our great motherland. There are many islands in the beautiful Xisha, but each island is very small. Although these islands are small, there are still lush tropical trees on them. There are many insects and other small animals living in the forest, and many seabirds live on the branches. Our heroic PLA soldiers are here, together with these insects and seabirds, guarding the motherland's coastal areas day and night. Soldiers live on a large desert island, and the conditions are very difficult, because there is no soil for growing crops, and even fresh water for human consumption is scarce. However, the warriors who guarded the island took the island as their home, carried forward the spirit of not being afraid of hardship and fatigue, planted beautiful flowers and vegetables on the island, and dressed the island as beautiful as a garden. "Let's raise some chickens." Some soldiers argue. So they brought some cocks and hens from the mainland. These "guests" from afar are used to living on the island. Proud cocks craned their necks to crow, and flocks of hens foraged freely in the grass and Woods on the island, laying eggs one by one, bringing vitality to the silent island. There are more and more chickens. Later, no one knows how many chickens there are on the island. When it comes to improving life, a cook can quickly pick up a basket of eggs as long as he walks around the Woods. However, before long, an unexpected problem appeared-the mouse became a disaster. I don't know who accidentally brought the mouse to the island. This mouse not only looks annoying, but also harms soldiers' vegetable gardens, gnaws furniture in barracks and even bites off buried cables. The most irritating thing is that with more rats, chickens can't live in peace. Soldiers once found that rats killed more than 20 chickens in one hour during the day. At night, two or three big mice dared to attack the old hen. How to deal with the rampant attack of rats? The superior sent a rodenticide expert and brought the most poisonous rodenticide. Groups of mice were poisoned. However, as soon as the experts left, the remaining mice made a comeback and multiplied at an even more alarming rate. Finally, chickens can no longer be raised. Fortunately, the chicken never came back. They hid in the depths of the forest and became veritable "pheasants". So, how to repel the attack of rats? By the way, use a cat! Cats are natural enemies of mice. The soldiers brought cats from the mainland, and the cats quickly killed the mice, and they were more thorough than any rodenticide. However, cats also have cat problems. Isn't it often said: "greedy cat"? When the mice were eliminated, they began to think about boobies perched on branches. The greedy cat climbed up the branch deftly and ate the chicken in the nest. Sometimes they sneak up the branches and sneak up on big birds flying back from the sea. Soldiers patrol the island and often find piles of booby feathers and bones under low maple trees. After investigation, it turned out that the greedy cat was responsible. Baby boomers have white feathers, long mouths and duck-like webbed claws, which can help them swim and fish at sea. They are the key protected birds in the world. These greedy cats can't be allowed to do evil for a long time, so the soldiers have dogs again. The soldiers, with their dog teams, searched the Woods for greedy cats who did evil. Once found, they let the dogs out and killed them. The cat's troubles have decreased, but the dog's troubles have come again. Dogs love to fight and bark everywhere, which makes the island restless. Some people say that the problem of not having a dog will be solved. But if you don't have a dog, will the series of problems mentioned above reappear? Island warriors are troubled by hardships ... all kinds of creatures in the world are like parts of a complex machine, interdependent and restrictive. Geographically, it is called the food chain. It is also because of the food chain that nature maintains a dynamic balance. However, if we accidentally destroy the balance between them, it may bring us great trouble. Stamp that almost caused war: The Dominican Republic of the West Indies issued a stamp of 1900 with a map of Dominica on it. It was this stamp that almost caused a war between Dominica and neighboring Haiti. It turned out that due to the negligence of the graphic designer, the boundary between the two countries was not drawn accurately enough, and a small part of Haiti was included in the territory of Dominica. After the stamp was issued, Haiti regarded it as a provocative act by Dominica that deliberately violated its territory and sovereignty. Dominica believes that Haiti is making a mountain out of a molehill and taking the opportunity to make trouble. The two sides massed heavy troops in the border area, and war was imminent. Finally, Dominica gave in and stopped using this stamp, and a storm subsided.

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