Pork is an indispensable meat on the daily table. Many people think that any part of the pig can be eaten, so it is very casual to eat. But you know, there are three pieces of pork that must not be eaten. These three pieces of pork must be removed from the slaughter. If you accidentally eat the three pieces of pork, you may have nausea and vomiting, and even serious life may be endangered.
Pork can not eat in three parts
Adrenal gland
The adrenal gland is located in front of the kidneys of the pigs, which is often referred to as "small waist." After eating the adrenal gland for a few minutes, people can have a sharp rise in blood pressure, nausea, dizziness, headache, palpitations, numbness in the limbs and tongue, muscle tremors, and even pale, dilated pupils. Hypertension, coronary heart disease patients can therefore induce stroke, angina pectoris, myocardial infarction and so on.
thyroid
The thyroid gland is located in the front lower part of the pig tracheal throat, commonly known as "chestnut meat." After eating meat containing thyroid, people may have symptoms such as shortness of breath, arrhythmia, headache, tinnitus, irritability, excessive sweating, anorexia, nausea, vomiting, abdominal pain, and diarrhea.
Lymph node
The lymph nodes of the pigs are grayish white or light yellow, such as the size of the beans to the date of the jujube, distributed in the whole body of the pig, commonly known as "flower meat." When a pig develops a disease, the lymph nodes are often the place where the lesion is metastatic. If you eat pork without removing the lymph nodes, you will ingest a large number of germs and the toxins they produce, causing poisoning or infectious diseases. Therefore, when slaughtering pigs, these three things on the pig must be removed to ensure the safety of the pork.
Pig neck meat
The blood neck meat is the neck meat of the pig. When the slaughterhouse slaughter the pig, the blood is started from the neck of the pig. Therefore, the meat at the neck is bruised. It looks bloody and is called the “blood neck meatâ€. Meat, meat.
There are thyroids and lymph nodes on the neck of the pig. Thyroid hormone is difficult to destroy by cooking. Excessive intake will interfere with human secretion, causing nausea, vomiting and even neurotoxicity. Lymph nodes are all over the body, but lymph nodes are concentrated in the neck, congestion, hemorrhage, edema, suppuration, necrosis and other diseases ( Commonly known as "meat dates", there are a large number of harmful substances such as bacteria, viruses, toxins, and pathogenic microorganisms.
If you find gray, yellow or dark red meat in your neck or other places, you can't eat it because there are many germs and viruses.
These four parts of the pig should be eaten less.
Pig liver
Needless to say, the nutrition of pig liver, but the statement of pig liver toxins is even more worrying. The liver is a detoxifying organ. Generally, there are many blood and bile with toxic substances, and there may be parasites. Therefore, it is necessary to carefully clean and cook the liver.
pig intestine
The pig's large intestine is also known as the fat intestine. The pig intestine is used to transport and digest food. It is the place where the residue after food digestion (that is, the stool) is discharged, so it is a place with unique taste. There may be more microorganisms here, and there may be parasites and pathogens.
Pig lung
There is a saying on the Internet that there are many alveoli in the lungs of the pigs, and the alveoli are gas exchange sites, which will collect a lot of dust from the air, and there will be a lot of dust in the lungs of the pigs. Coupled with the love of the pig, it will suck in more dust, so the pig lungs can not eat. But in fact, it is not so exaggerated, pigs do not eat soil, as long as the pig lungs are cleaned, eating pig lungs is very nutritious.
Pig brain
Everyone said that the high cholesterol in the pig brain can not be eaten. It is true that the cholesterol content in the pig brain is relatively high, and the cholesterol content per 100 grams of pig brain is as high as 2571 mg. However, at home and abroad, it is agreed that the amount of cholesterol in food does not have much effect on the amount of cholesterol in the body and cardiovascular disease.
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Lamp panel
The lamp panel is divided into ordinary infrared lamps (Dingyuan and Guanglei) and array lamps. The array camera is also divided into 1W, 2W and 3W. Therefore, when choosing infrared lamps, if it is an ordinary infrared lamp, try to choose Dingyuan and 3W array lamps. Since the appearance of infrared lamps is generally invisible, some cottage cameras are filled with Guanglei and 1W array cameras are filled with 3W array cameras. Therefore, try to choose a large brand when choosing cameras.
Maximum Aperture
The real value of the maximum aperture is to improve the light intake under low light conditions, so as to achieve the best exposure combination. In general, the ability to visualize the lens is not required for shooting landscapes. In addition, the lens caliber is not required for shooting landscapes except in particularly dark places. However, when the 70-200mm zoom lens is equipped with a 2-fold zoom lens to make the telephoto section become 400mm and AF is used for automatic focusing, it is better to choose a lens with the largest aperture of F2.8. Large aperture is conducive to accurate focusing in dark conditions. When shooting people with a large aperture lens, even in places where the light is weak, the handset can also use natural light to shoot. In addition, the lens with the largest aperture can bring fast shutter speed, so sports photography also needs a large aperture lens.
Another reason for requiring the lens aperture to be large is to be able to visualize the background freely and ensure the quality of visualization. When the aperture of the lens with the maximum aperture of F1.4 is reduced to F2, both the imaging quality and the blurring quality of the background are better than those of the lens with the maximum aperture of F2. Therefore, it is of great value to reduce the aperture of a large aperture lens by one stop. Any photographer should be good at using the lens.
focal length
The first thing to pay attention to when selecting a lens is the focal length of the lens. In fact, focal length is a matter of perspective. Different focal lengths and perspectives are different. In addition, users should be clear about what is the main purpose of buying lenses? Is it for scenery or people. As we all know, it is better to use a wide-angle lens when shooting landscapes, and a telescopic lens when shooting people. Therefore, you should first decide the focal length of the lens you want to buy according to the purpose of photography.
The best focal sections for shooting scenery are 24 mm wide angle focal section and 200 mm telescopic focal section (both are based on 35 mm specifications, the same below). When the wide-angle focus segment of the standard zoom lens evolves from 28mm to 24mm, the viewing angle becomes larger, and the range of scenery that can be stored is greatly expanded. Generally speaking, the maximum aperture of the lens is not required for shooting landscapes. If you are mainly shooting landscapes, a wide angle focal length of 24mm is basically enough when you select a zoom lens. As for the telephoto section, it must be at least 200mm. If the telephoto section is 300mm or 400mm, it is more ideal, and the degree of freedom will be greatly improved. The telephoto focus segment of traditional zoom lens is 300 mm, which is 450 mm for digital SLR. The focal length has been expanded by 1.5 times, which makes it more enjoyable to use. This is the value of digital SLR. The wide-angle focal section of the digital special ultra wide-angle lens produced is generally 12mm, equivalent to 18mm of 35mm, which is nearly 1.5 times larger than the 28mm focal section of 35mm, thus greatly widening the left and right range of the scenic scene.
The best focal length for shooting people is 85mm. In terms of 35mm standard, 85mm focal length is basically used as the standard for shooting characters. The portrait taken by the 85mm focal section is basically close to the picture effect taken by the medium frame camera. It is not only suitable for the distance, but also the face of the person looks very natural. The distance between the camera and the person being photographed can basically be kept at the normal speaking distance. The 85mm focal length can also effectively blur the background and prominent characters. In order to obtain good visualization effect, the lens with the largest aperture should be selected. The 85mm focal length is about 135mm on the digital SLR. Although the sense of distance of the shot is a little weak, it is basically OK, so the focal length of the person lens should be at least about 85mm.
A 100mm macro lens is enough for traditional SLR to shoot flowers. The 100mm macro lens can be used for equal magnification photography, which can make the flowers very large. However, when taking equal magnification photography or near equal magnification photography, due to the depth of the long focus scene, it is easy to shake, so anti shake measures should be considered when taking photos. From this point of view, 50mm macro lens is easier to use on digital SLR.
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