What words are there in the hierarchical word group?
Sentence: In animal experiments, embryonic stem cells produced by parthenogenetic blastomeres can also differentiate into various cell types during culture, and through teratoma test, cells from three germ layers are formed.
explanation: because of the rapid cell division and the increasing number of cells in the embryo, the embryo of human or higher animals divides into three layers: outer layer, middle layer and inner layer. Also called embryo leaf.
2, laminated glass
Sentence: At the same time, this paper applies the "frequency change ratio" method to the PVB damage detection of laminated glass plate, and establishes the analysis process of the frequency change ratio method with the derived finite element formula.
explanation: a kind of safety glass is bonded by adding plastic such as polyethylene between two pieces of glass. When this kind of glass is broken, the fragments will not fly away, and it is often used in vehicles such as cars.
3. Formation of stratum
Sentence: When cyanobacteria and other microorganisms grow in shallow water, some sediments are deposited on them, which combine to form small stone towers and mounds like rocks, and finally gradually form layered stromatolites.
explanation: a kind of tissue in plants, with closely arranged cells and the ability of continuous division and proliferation. The cells of cambium differentiate to form phloem and xylem, and make the stem or root thicker.
4. ectoderm
Sentence: It was found that the CAMEC of chicken embryos was under the chorionic epithelium of ectoderm at the 8th, 1th and 12th day of embryo age, and EC gradually moved from mesoderm to ectoderm with the increase of embryo age.
explanation: the outer layer of the embryo. Organs such as epidermis, hair and nerve tissue are all formed by ectoderm.
5. Alluvium
Sentence: Based on the successful experience of freezing engineering and sinking engineering in freezing section of main shaft in Guqiao Coal Mine, this paper discusses several problems of safe and rapid sinking construction by freezing method in deep alluvium.
explanation: generally speaking, mud, sand, gravel and other substances are transported to the river bed and other low places due to the scouring of running water, forming layered sediments.
6. Hierarchy
Sentence making: The levels and types of details of use case documents are very different in different organizations or companies, even from one project to another in the same organization.
explanation: (1) the order of content (speaking and writing): ~ clear. (2) affiliated institutions at all levels: reduce ~ and streamline personnel.
7. Fault earthquake
Sentence: After the main earthquake, the stress propagation and release process of the compressional thrust fault earthquake is relatively slow, which may lead to a strong aftershock and a long duration.
explanation: see [tectonic earthquake].
8. Outer Space
Sentence: Moreover, the study of Jupiter shows that the gas giants in outer space are gravitational shelters, and they protect the inner rocky planets? And any life form on the planet? Not affected by frequent collisions from asteroids.
explanation: see [space].
9. Superstructure
Sentence: Clinton linked the challenges faced by the demonstrators with those of the Arab Spring in Tunisia and Egypt, who overthrew the dictatorial government but still need to establish links with the original superstructure.
interpretation: refers to the political, legal, religious, artistic and philosophical viewpoints based on the economy, and the political and legal systems suitable for these viewpoints. The economic base determines the superstructure, and the superstructure reflects the economic base. Once the superstructure is formed, it has relative independence and plays a decisive role under certain conditions.
1. stratocumulus
Sentence: He saw piles of white stratocumulus in the sky, which seemed to be layers of delicious ice cream. There are sparse feather-like cirrus clouds above, which set off the clear sky in Wan Li in September.
explanation: a kind of cloud, a low and diffuse gray-white cloud curtain. Mainly composed of small water droplets. It occasionally rains in Mao Mao in the clouds.
11. Faults
Sentences: Using a series of assumptions about fault mechanics and pressure accumulation rate, the US Geological Survey predicted that an earthquake of magnitude 6. would occur in Parkfield from 1988 to 1992.
explanation: due to the change of the earth's crust, the strata fracture and the relative displacement along the fracture surface occurs in the vertical, horizontal or inclined direction.
12. Laminar flow
Sentence: With the increase of alloy solid content in the roller-shoe cavity, the free crystals are subjected to laminar shear during the growth process of dendrite, and the secondary dendrite arms are broken and broken to form free crystals;
explanation: when the fluid viscosity is high and the flow velocity is low, the fluid particles only move along the flow layer, but not laterally. This flow state is called laminar flow.
13. Upper level
Sentence: Or if I misplace them a little at other times, they are two sons of the upper middle class, and they feel degraded because of hypocrisy and hypocrisy, because it fills the world around them.
explanation: the upper layer or layers (referring to institutions, organizations and strata): ~ leaders.
14. Permeable layer
Sentence: On this basis, the influence of watershed characteristics such as land use, impermeable layer and soil physical characteristics on these 17 discharge indexes is studied from three aspects by using statistical methods.
explanation: it refers to the porous or fissured rock stratum with good water permeability. If there is groundwater, it is called aquifer.
15. Ionosphere
Sentence: Although the detailed information has not been published, according to the BBC's understanding, scientists have also observed the "huge" signal that appeared in the ionosphere before the earthquake of magnitude 7.8 occurred in China on May 12th.
explanation: a layer of the atmosphere, located from the top of the stratosphere to an area about 1 kilometers above the ground. The air is thin, and the temperature increases with height. Due to the action of cosmic rays, gas molecules are ionized into positive ions and free electrons. The ionosphere can reflect radio waves, especially short waves.
16. Ore bed
Sentence: This paper analyzes the geological characteristics of bauxite deposit in western Xiaoyi, probes into the occurrence horizon of ore bed, the shape of ore body, the structure and structure of ore rock section, and describes the genesis of bauxite deposit in western Xiaoyi.
explanation: minerals distributed in layers in the stratum.
17. Stratosphere
Sentence: By borrowing the previous convention system dealing with ozone depletion in the stratosphere, acid rain caused by sulfur oxide emissions and nuclear weapons, the Kyoto Protocol system was quickly established.
explanation: the old name of stratosphere.
18. Cerebral cortex
Sentence making: However, if you want it to explore your cerebral cortex more deeply, register a Google account, and then the Google suggestion function will begin to form its suggested search query results based on your previous search.
explanation: one layer on the surface of the two hemispheres of the brain is called cerebral cortex, which is slightly gray and is composed of nerve cells. Each hemisphere is divided into frontal lobe, parietal lobe, temporal lobe and occipital lobe. It is the center of the advanced nervous system, through which thinking activities such as memory, analysis and judgment have to pass, and it is the main institution to ensure the unity within the organism and with the surrounding environment. Also called cerebral cortex. Cortex or cortex for short.
19. Surface
Sentence: Last autumn, the LCROSS spacecraft crashed into a crater that was always in the shadow, and found signs of water ice in the surface, but those water ice may have been accumulated due to the impact of ancient comets.
explanation: a layer on the surface of an object.
2. Atmosphere
Sentence: Once we find such a planet, we should try to dim the light from its star, so that we can "see" the planet completely and analyze its atmosphere.
explanation: a layer of gas surrounded by the outside of the earth. According to different physical properties, the atmosphere is usually divided into troposphere, stratosphere and ionosphere.
21. Cortex
Sentencemaking: For teenagers, this process seems to start from the back of the brain and then move to the front. Therefore, the crucial control center? Prefrontal cortex? It became the last area to be involved.
explanation: (1) a layer on the surface of human or organism tissue: kidney ~ | plant stem ~. (2) The abbreviation of cerebral cortex.
22. Oil layer
Sentence: When light is captured on a two-dimensional curved surface, the surface of the object is required to be very smooth, which is enough to reflect most of the light into the oil layer cleanly instead of being scattered at all angles.
explanation: the stratum where oil is accumulated.
23. Rock formations
Sentence: That is to say, one thing is very clear: we live in the Anthropocene? An era when everything, from air to rock, is dominated by human activities.
explanation: layered rocks in the earth's crust.
24. Stratum
Sentence: They found that the sedimentary layer known as the K-T boundary at that time contained extremely high concentration of iridium. This ancient stratum with a history of 65.5 million years separated Cretaceous fossils from Tertiary fossils.
explanation: the earth's crust is composed of layers of rocks, and this rock hierarchy system is called stratum.
25. Clouds
Sentence: The lightning seen by these machines is something we have never seen before. We can clearly see that it spreads downward from clouds or upward on high objects.
explanation: layered clouds: many peaks are ~| gray and low-pressure above the big forest.
26. Grassroots
Sentences: Populist criticism on the Internet has always been at the forefront of anger? And it may be a harbinger of what grassroots protests will be like in Wen Da and China authorities in the future.
explanation: the lowest level in all kinds of organizations has the most direct contact with the masses: ~ unit | ~ cadres.
27, inversion layer
Sentence: In this paper, the distribution of boundary layer wind field and inversion layer in the middle and lower reaches of the Yangtze River is statistically analyzed. It is found that there are sometimes strong wind speed zones in the boundary layer in the middle and lower reaches of the Yangtze River, which are mainly represented by northeast and southwest jets.
explanation: under normal circumstances, the higher the altitude, the lower the temperature, but sometimes the temperature increases with the altitude in a certain layer of air, and the atmosphere with this phenomenon is called inversion layer.
28. The lower floor
Sentence: On a recent day, he came to the university and stared at the 11-storey building. The university was built in a slum, but it has begun to show the atmosphere of the lower middle class area.
explanation: the following layer or layers (referring to institutions, organizations and strata): go deep ~.
29. Troposphere
Sentence: Joint Research Center for Environment and Sustainability. (February 2, 211) A New Assessment of the Role of Black Carbon and Tropospheric Ozone in Climate Change was adopted in Council of Europe on February 21, 211.
explanation: a layer of the atmosphere, close to the ground, has the highest air density, and convection often occurs, and the temperature decreases with height. The main weather phenomena, such as rain, snow and hail, all occur on this floor. Its height is ten to twelve kilometers in the temperate zone, seventeen to eighteen kilometers around the equator and eight to nine kilometers at the poles. Also known as the thermocline.
3. Stratosphere
Sentence: The so-called "hole" here is not literal, and there is no ozone in the stratosphere at all. Scientists use the term hole to describe these areas where the ozone concentration is lower than the historical reading of more than 22 Busson units.
explanation: a layer of the atmosphere between the tropopause and 8km above the ground. From the stratosphere bottom to the height of 3-35km, the temperature changes little. In the layer of 35km-55km, the temperature rises with the height due to the existence of ozone, and above 55km, the temperature decreases with the height. Formerly known as stratosphere.
31. Aquifer
Sentence: Libyans say they will stop using the water from the Northwest Sahara Water System and Nubian Sandstone Water System (the largest fossil aquifer in the world, owned by Egypt, Chad and Sudan) to grow wheat.
explanation: see [permeable layer].
32. Interlayer
Sentence: The new portable computer bag includes a folded-down part of a large briefcase or a separate protective interlayer without other sundries, which can be easily checked by scanning equipment.
explanation: a double-layer wall or other sheet, hollow or sandwiched with something else: ~ wall | ~ glass.
33. Endoderm
Sentence: Once the inhibitory factors of differentiation are removed or appropriate inducers are added, ES cells can differentiate into various types of specialized cells of endoderm, mesoderm and ectoderm.
explanation: the inner layer of the embryo. Intestine, stomach, digestive gland, lung and other organs are formed by endoderm.
34. Class
Sentence: He praised Palin's ability to fight corruption and "deep-rooted bureaucracy" and mentioned that she is rooted in the working class and can understand the problems she faces.
explanation: (1) refers to the levels divided by different social and economic status in the same class. For example, the peasant class is divided into poor peasants and middle peasants. (2) refers to the social groups formed by different classes and some same characteristics, such as intellectuals who mainly work with their brains.
35. Water-resisting layer
Sentence: The drainage channel includes: paving slurry seal as water-resisting layer, transforming flat stone into horizontal stone with drainage pipeline, and transforming the well frame of the rain mouth to make it have holes corresponding to the horizontal stone.
explanation: see [impermeable layer].
36. Middle level
Sentence: Today, her daughter is studying in a private boarding school and is preparing for the entrance examination for entering a top junior high school. Ms. Chen herself has returned to work as a middle manager in an oil company.
explanation: one or more layers in the middle (referring to institutions, organizations, strata, etc.).
37, anticline layer
Sentence: Interlayer fracture zone structure controls the fracture zone skarn ore body, which is a fracture zone formed by interlayer sliding of anticline.
explanation: the middle part of the rock is arched into a saddle shape. It is often the best oil storage structure.
38. Coal seam
Sentence: This company is cooperating with two large oil companies: with Exxon to produce biofuels from algae, and with BP to study microorganisms that are helpful for extracting natural gas from coal seams.
explanation: underground coal mines are distributed in layers.
39. Impervious layer
Sentence: On this basis, the influence of watershed characteristics such as land use, impermeable layer and soil physical characteristics on these 17 discharge indexes is studied from three aspects by using statistical methods.
explanation: refers to rock stratum with low water permeability, such as clay, dense granite and mudstone.
4. Close layers
Sentence making: Close layers of "friends" are combined into a desert of friendship, not to mention friendship in a strict sense, but even friendship in a broad sense. If it is true and pure, it is hard to find it.
explanation: the description of ~ is much denser: there are ~ jujube trees on the hillside, so it is difficult to walk up.
41. Stratified forest
Sentence: Tens of thousands of granite blocks stand on the top of the cliff, hanging alone on the edge of the cliff, surrounded by deep forests in the valley, and their columns stand in fast-flowing streams.
explanation: overlapping.