What words are there in the hierarchical word group?

Sentence-making: In animal experiments, embryonic stem cells produced by parthenogenesis blastomeres can also differentiate into various cell types in the process of culture, and cells from three germ layers are formed through teratoma test.

Description: Because of the rapid cell division, the number of cells in human or higher animal embryos is increasing, which is divided into outer, middle and inner layers. Also called embryo leaf.

2, laminated glass

Sentence making: At the same time, the "frequency change rate" method is applied to the PVB damage detection of laminated glass plates, and the analysis process of the frequency change rate method is established by using the derived finite element formula.

Description: A kind of safety glass is made by adding polyethylene and other plastics 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. Forming layer

Sentence: When microorganisms such as cyanobacteria 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.

Description: A kind of tissue in plants, with closely arranged cells, has the ability of continuous division and proliferation. The cells of cambium differentiate to form phloem and xylem, which makes the stem or root thicker.

4, ectoderm

Sentence-making: It was found that on the 8th, 10 and 12 days, the chick embryo was located under the chorionic epithelium of the ectoderm. With the increase of embryo age, EC gradually moves from mesoderm to ectoderm.

Explanation: The outer layer of an embryo. Organs such as epidermis, hair and nerve tissue are all formed by ectoderm.

5. Alluvium

Sentence: According to the successful experience of freezing engineering and sinking engineering in the freezing section of main shaft in Guqiao Coal Mine, this paper discusses several problems of safe and rapid construction of sinking by freezing method in deep alluvium.

Interpretation: Generally speaking, mud, sand, gravel and other substances are transported to low-lying places such as river beds due to water erosion, forming layered sediments.

6. Level

Sentence-making: The level and type of use case document details are very different in different organizations or companies, even from one project to another in the same organization.

Explanation: (1) (speaking and writing) Content sequence: ~ clear. (2) Subsidiary bodies at all levels: reduce to streamline personnel.

7. Fault earthquake

Sentence: After the main earthquake, the stress propagation and release process of compressive thrust fault earthquake is relatively slow, which may lead to strong aftershocks and long duration.

Description: See [Tectonic Earthquake].

8. Outer space

Moreover, the study of Jupiter shows that the gas giant planets in outer space are gravity shelters, and they protect the inner rocky planets? And any life form on this planet? Not affected by frequent collisions of asteroids.

Description: See [Space].

9. Superstructure

Sentence: Clinton linked the challenges faced by demonstrators to the Arab Spring in Tunisia and Egypt, which overthrew dictatorships and still need to be linked to the original superstructure.

Interpretation: refers to the political, legal, religious, artistic, philosophical and other viewpoints based on economy, as well as the political, legal and other systems adapted to 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.

10, stratus

Sentence: He saw piles of white stratocumulus clouds in the sky, like layers of delicious ice cream. There are sparse feather cirrus clouds above, which set off the clear sky in Wan Li in September.

Description: A kind of cloud, a low and diffuse gray-white cloud curtain. It is mainly composed of small water droplets. Mao Mao occasionally rains in the clouds.

1 1, failure

Sentence: Using a series of assumptions about fault mechanics and pressure accumulation rate, the US Geological Survey predicts that Parkfield will have an earthquake of magnitude 6.0 between 1988 and 1992.

Description: Due to the change of the earth's crust, the strata are fractured, and the relative displacement in vertical, horizontal or inclined directions occurs along the fracture surface.

12, laminar flow

Sentence: With the increase of alloy solid content in the roller shoe cavity, the free crystal is subjected to laminar shear during dendrite growth, and the secondary dendrite arm breaks and breaks to form the free crystal;

Note: When the fluid viscosity is high and the flow velocity is low, the fluid particles only move along the flow layer, and do not move laterally. This flow state is called laminar flow.

13, upper layer

Sentence: Or if I put them in the wrong time, they are two sons of the upper middle class, and they feel wronged by hypocrisy and hypocrisy, because it is full of the world around them.

Explanation: upper level (referring to institutions, organizations and strata): ~ leaders.

14, permeable layer

Sentence making: On this basis, the influence of watershed characteristics such as land use, impermeable layer and soil physical characteristics on this 17 discharge index is studied from three aspects by statistical methods.

Explanation: refers to porous or fractured rock stratum with good water permeability. If there is groundwater, it is called an aquifer.

15, ionosphere

Sentence: Although the detailed information has not been released, according to the BBC, scientists have also observed the "huge" signal that appeared in the ionosphere before the China earthquake with magnitude 7.8 on May 12.

Description: A layer of the atmosphere, located from the top of the stratosphere to an area about 1000 km above the ground. The air is thin and the temperature rises with height. Due to cosmic rays, gas molecules are ionized into positive ions and free electrons. The ionosphere can reflect radio waves, especially short waves.

16, joint

This paper analyzes the geological characteristics of bauxite deposits in western Xiaoyi, discusses the occurrence horizon of ore beds, the shape of ore bodies, the structure and structure of ore-rock sections, and expounds the genesis of bauxite deposits in western Xiaoyi.

Description: Minerals are distributed in layers in the stratum.

17, stratosphere

Sentence: The Kyoto Protocol system was quickly established by borrowing the previous convention systems to deal with stratospheric ozone depletion, acid rain caused by sulfur oxide emissions, and nuclear weapons.

Explanation: The old name of stratosphere.

18, cerebral cortex

Sentence making: However, if you want it to explore your cerebral cortex more deeply and register a Google account, then the Google suggestion function will start to form its suggested search query results based on your previous search.

Explanation: There is a layer on the surface of the two hemispheres of the brain called cerebral cortex, which is slightly gray and consists of nerve cells. Each hemisphere is divided into frontal lobe, parietal lobe, temporal lobe and occipital lobe. It is the center of the higher nervous system, through which thinking activities such as memory, analysis and judgment 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 layer

Sentence: Last autumn, LCROSS crashed into a crater that had been in the shadow, and found signs of water ice on the surface, but those water ice may have accumulated due to the impact of ancient comets.

Description: A layer on the surface of an object.

20. 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, atmosphere is usually divided into troposphere, stratosphere and ionosphere.

2 1, cortex

Sentence making: For teenagers, this process seems to start from the back of the brain and then go to the front. Therefore, the crucial control center? Prefrontal cortex? It became the last area to be involved.

Explanation: (1) A layer on the tissue surface of human body or organism: the kidney of plant stem. ② The abbreviation of cerebral cortex.

22, oil layer

Sentence: capturing light on a two-dimensional curved surface requires that the surface of the object is very smooth enough to reflect most of the light into the oil layer cleanly, rather than scattering it at all angles.

Description: The stratum where oil accumulates.

23. Rock formations

Sentence making: In other words, one thing is clear: We live in the Anthropocene? An era in which everything from air to rocks is dominated by human activities.

Description: Layered rocks in the crust.

24. stratum

Sentence: They found that the sediment called the K-T boundary at that time contained extremely high concentrations of iridium. This ancient stratum with a history of 65.5 million years separates Cretaceous fossils from Tertiary fossils.

Explanation: The crust is composed of multiple layers of rocks. This rock hierarchy is called stratum.

25. Cloud

Sentence: These machines see lightning that we have never seen before. It can be clearly seen that it spreads downward from clouds or upward on tall objects.

Description: stratus clouds: many peaks are above the big forest ~ | gray ~ low pressure.

26, grassroots

Sentence-making: Populist criticism on the Internet has always been at the forefront of anger? This may indicate that grassroots protests will take place in Wenda and China authorities in the future.

Explanation: the lowest level in various organizations that is in direct contact with the masses: ~ unit | ~ cadres.

27, inversion layer

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 areas in the boundary layer of the middle and lower reaches of the Yangtze River, mainly represented by the northeast and southwest jets.

Note: Generally, the higher the distance from the ground, the lower the temperature, but sometimes the temperature rises with the height in a certain layer of air. The atmosphere with this phenomenon is called inversion layer.

28, the lower level

Sentence: On a recent day, he came to the university and stared at the building on the 1 1 floor. The university was built in a slum, but it has begun to show the atmosphere of the middle and lower classes.

Explanation: the following layer or layers (referring to institutions, organizations and strata): go deep ~.

29. Troposphere

Joint research center for environment and sustainability. (20 1 1 February 20th) Council of Europe adopted a new assessment on the role of black carbon and tropospheric ozone in climate change on February 20th, 201year.

Description: A layer of the atmosphere, close to the ground, with the highest air density, frequent convection, and the temperature decreases with height. Major 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 thermocline.

30. stratosphere

Sentence: The so-called "hole" here is not literal. There is no place in the stratosphere that is completely free of ozone. Scientists use the word hole to describe these areas where the ozone concentration is lower than the historical reading of more than 220 Busson units.

Explanation: The atmosphere between the tropopause and 80km above the ground. From the bottom of the stratosphere to the height of 30-35 kilometers, the temperature changes little. In the layer of 35km-55km, due to the existence of ozone, the temperature increases with height, and above 55km, the temperature decreases with height. Formerly known as the stratosphere.

3 1, aquifer

Sentence: Libyans say they will stop using the water from the Northwest Sahara River System and Nubian Sandstone River System (the world's largest fossil aquifer, owned by Egypt, Chad and Sudan) to grow wheat.

Description: See [Permeable Layer].

No.32, mezzanine

Sentence: The new portable computer bag includes a folded part of a large briefcase or a separate protective interlayer, which has no other sundries and can be easily checked by scanning equipment.

Description: double wall or other plates, hollow or sandwiched with other things: ~ wall | ~ glass.

33. Endoderm

Sentence making: Once the inhibitor of differentiation is removed or an appropriate inducer is added, ES cells can differentiate into various types of specialized cells of endoderm, mesoderm and ectoderm.

Explanation: The inner layer of an embryo. Organs such as intestine, stomach, digestive gland and lung are formed by endoderm.

34. Classes

Sentence making: He praised Palin's ability to fight corruption and "deep-rooted bureaucracy" and mentioned that she was rooted in the working class and could understand the problems she faced.

Explanation: (1) refers to the difference of social and economic levels within the same class. For example, the peasant class is divided into poor peasants and middle peasants. (2) refers to social groups composed of different classes and some similar characteristics, such as intellectuals who are mainly engaged in mental work.

35. Aquifer soil layer

Sentence: The drainage channel includes: paving slurry seal as water-resisting layer, transforming flat stone into transverse stone with drainage pipeline, and transforming the well frame of the rain mouth into a channel corresponding to the transverse stone.

Note: See [Impervious Layer].

36. Medium level

Sentence: Now, her daughter is studying in a private boarding school and is preparing for the entrance examination for a top junior high school. Ms. Chen herself has returned to an oil company as a middle manager.

Explanation: one or more layers in the middle (referring to institutions, organizations, strata, etc. ).

37. Anticline layer

Sentence: the structure of interlayer fracture zone controls the skarn ore body in fracture zone, which is a fracture zone formed by interlayer sliding of anticline.

Description: The middle part is arched into a saddle-shaped rock stratum. It is often the best oil storage structure.

38, coal seam

Sentence: The company is cooperating with two large oil companies: Exxon to produce biofuels from algae, and BP to study microorganisms that can help extract natural gas from coal seams.

Description: Layered underground coal mines.

39. Impervious layer

Sentence making: On this basis, the influence of watershed characteristics such as land use, impermeable layer and soil physical characteristics on this 17 discharge index is studied from three aspects by statistical methods.

Explanation: It refers to rocks with low permeability such as clay, dense granite and mudstone.

40, dense layer

Sentence making: The dense layers of "friends" combine into a desert of friendship, not to mention friendship in a strict sense, even friendship in a broad sense. If it's true and pure, it's hard to find.

Description: the description of ~ is very dense: there are ~ jujube trees on the hillside, which is difficult to walk on.

4 1, stratified forest

Sentence: Tens of thousands of granite blocks stand on the top of the cliff, surrounded by deep valleys and forests, and their columns stand in the swift stream.

Explanation: Overlapping Woods.

42. Melaleuca

Sentence making: At present, Tujia people embroider thousands of shoes, slippers and insoles by hand.

Description: (~) The sole is made up of several layers of cloth with white stripes on the edge.

43, straton model

Sentence-making: This paper discusses the weak lepton decay, electromagnetic decay and various two-body strong decay processes of mesons by using the B-S wave function of mesons obtained from the heavy-layer model.

Explanation: Beijing Basic Particle Theory Group 1965 puts forward the theory that basic particles are composed of stratons, which explains the properties of many basic particles and is called straton model. According to the idea that matter is infinitely divisible, the material structure should have infinite levels, that is, the things that make up protons and neutrons are still divisible. They are just one of the infinite levels of the material structure, so they are called layers.

44. Cork layer

Sentence making: Its resistance is related to thicker epidermal cells and cork layer, higher tannin and potassium content, and stronger catalase and polyphenol oxidase activities.

Explanation: A part of plant cortex, which is closely combined by dead cells and air, has the functions of protecting plants, controlling water evaporation and preventing cold, and is more common in the stems of trees.

45. Walk up a flight of stairs

Sentence making: The inherent possibility of this design is that new elements can be added to XML (corresponding to the fields in the class), which makes it possible to make an API semantically by going up a flight of stairs.

Allusion: The original intention is that if you want to see farther, you must climb higher. After the metaphor, the performance was further improved.

46, emerge in endlessly

However, with the endless stream of bad news about the world's second largest economy, people have increasingly doubted whether the plan is enough to stimulate economic growth in recent days.

Allusions: layer: repetition; Poverty: exhaustion. Appear one after another, emerge in endlessly.

47. The mountains are mountainous.

Sentence: The cold air is getting warmer and warmer, and the mountains suddenly cast pencil-like shadows. The pine forest at the foot of the mountain is lush and looks like scary piles of malachite from a distance.

Allusions: layer: mountains are connected with mountains; Overlapping obstacles: many high-risk mountain obstacles. Describe many steep peaks.