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Anonymous users2024-02-061. Four-dimensional, that is, the four dimensions, is a spatial concept. In physics, the number of space-time coordinates is described by dimensions, and four dimensions are four dimensions, which are composed of an infinite number of three dimensions, and three dimensions are composed of an infinite number of two dimensions. The composition of other high-dimensional dimensions is so analogous, and the dimensions above three dimensions are collectively referred to as the high-dimensional dimensions of Qiaoyuanyuan.
2. Scientists have proved that the spatial fissures of our universe do have extended dimensions and convoluted dimensions. That is to say, our universe has a large, easy-to-see dimension like a water pipe extending horizontally, and a dimension that is condensed like a circle on a water pipe horizontally.
3. Those tightly condensed dimensions exist in a tiny space that cannot be detected even by our most sophisticated instruments.
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Anonymous users2024-02-051. Four-dimensional is four-dimensional color ultrasound, that is, color ultrasound examination to screen for malformations, which is generally carried out at 22 to 26 weeks of pregnancy.
2. The development of the fetus is detected by the four-dimensional color ultrasound machine, which not only measures the double parietal diameter of the fetus and the length of the femoral trace, but also the maturity of the placental posture and the amount of amniotic fluid.
3. The most important thing is to screen for malformations, such as whether there is lip and palate, congenital heart disease, cranial malformations, and severe deformities of the limbs.
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Anonymous users2024-02-04One-dimensional only length 2D Flat world, only length and width 3D Length, width and height Three-dimensional world The world we see with the naked eye Three-dimensional space is the space where the position of a point is determined by three coordinates. The objectively existing real space is three-dimensional space, with three measures: length, width, and height. The concept of multi-dimensional space introduced in mathematics, physics and other disciplines is a scientific abstraction based on three-dimensional space.
The Concept of Four-Dimensional One Space-Time Most of the "four-dimensional space" mentioned in daily life refers to the concept of "four-dimensional space-time" mentioned by Albert Einstein in his "General Theory of Relativity" and "Special Theory of Relativity". Our universe is made up of time and space. The relationship between time and space is that a time axis is added to the structure of space compared with the three axes of length, width and height of ordinary three-dimensional space, and this time axis is an axis of imaginary values.
According to Albert Einstein's theory of relativity, the three-dimensional space we face in our lives plus time constitutes the so-called four-dimensional space. One dimension is a line, two dimensions are a surface, three dimensions are static space, and four dimensions are dynamic space (because of time).
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Anonymous users2024-02-03Two: the fourth dimension: time in the four-dimensional space, time is linear, although the future can not be **, but there is only one source, there is only one future, no matter what will happen in the next second, there is only one future that will happen.
Similarly, if we ignore the 3D properties, we will see that any 4D object behaves as a line segment on the timeline.
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Anonymous users2024-02-02Categories: Social and People's Livelihood.
Analysis: The Confucian "four dimensions" was proposed by the statesman Guan Zhong in the Spring and Autumn Period. He said in "Pipe-Herdsman":
The state has four dimensions, and one dimension is absolutely inclined; Two-dimensional is dangerous; Three-dimensional overlay; The four dimensions are extinguished. "What is four dimensions? One is etiquette, the second is righteousness, the third is honesty, and the fourth is shame.
Rite - the hierarchical order of the upper and lower, the noble and the low, the young and the old, the rich and the poor.
Righteousness – a moral obligation to the state and society.
Honesty - frank and selfless, honest and honest.
Shame – Shame for bad things.
Four-dimensional color ultrasound can display the real-time dynamic image of the unborn baby in the womb of a pregnant woman, and you can see the development status of the fetus, or the real-time living image of other internal organs. To provide accurate scientific basis for early diagnosis of fetal congenital malformations. The best time to do a 4D examination is at 22 to 26 weeks of pregnancy, when the amniotic fluid is sufficient to facilitate the examination
Generally, four-dimensional color ultrasound is done at 20 to 26 weeks of pregnancy, and four-dimensional color ultrasound should be made in advance. You can go directly to the obstetric outpatient clinic with the relevant documents**, or you can go to the obstetric outpatient clinic through the Internet**, and the obstetrician will open a color ultrasound single to the color ultrasound room to make an appointment. Four-dimensional color ultrasound does not require holding urine or fasting. >>>More
Four-dimensional space-time. There are various multidimensional spaces in mathematics, but so far, the physical world we know is only four-dimensional, that is, three-dimensional space plus one-dimensional time. The high-dimensional space mentioned in modern microscopic physics is another meaning, which has only mathematical significance. >>>More
During the 22nd to 26th week of pregnancy, you need to do a four-dimensional color ultrasound examination, which can screen the health status of the fetus and whether there are malformations. After this time, you will not be able to do this kind of screening program.
The human brain cannot be said to be four-dimensional or multi-dimensional, it should be said whether the consciousness produced by the human brain is four-dimensional, and it cannot be simply said to be four-dimensional or five-dimensional, which is only the hypothetical hypothesis put forward by science for supernatural problems or the theoretical physics in order to solve some physical problems The four-dimensional space is a concept of time and space. In simple terms, any space with four dimensions can be called a "four-dimensional space". However, most of the "four-dimensional space" mentioned in daily life refers to the concept of "four-dimensional space-time" mentioned by Albert Einstein in his "General Theory of Relativity" and "Special Theory of Relativity". >>>More