The stratification in society is evident when we look at income levels across different strata.
社会分层在观察不同阶层的收入水平时表现得非常明显。
The
stratum of soil varies in depth and composition from one location to another.
土壤层的深度和成分在不同的地点有所变化。
Stratums of sedimentary rocks form the geological foundation of the region.
沉积岩层构成了该地区的地质基础。
In the academic world, there are distinct strata of researchers, from junior faculty to full professors.
学术界中有明显的研究层次，从初级研究人员到正教授。
The stratagem was to distract the enemy while our troops moved into position.
策略是分散敌人的注意力，同时我们的部队进入阵地。
The stratification of education often results in unequal opportunities for students from different backgrounds.
教育分层常常导致来自不同背景的学生机会不均等。
Stratums of clouds can indicate changes in weather patterns.
云层的分层可以预示天气模式的变化。
In the military hierarchy, officers form a separate
stratum from enlisted personnel.
在军事等级制度中，军官和士官形成不同的阶层。
Stratums of vegetation reflect the ecological diversity of an ecosystem.
植被层反映了生态系统的多样性。
The social scientist studied the class stratification in urban communities, focusing on income inequality.
社会科学家研究了城市社区的社会分层，特别是收入不平等的问题。
"The underground overpass section has a length of merely 77 meters but saw additional participation of five technical institutes from Shanghai and construction simulation countless times due to complicated geological conditions, especially the silt-sand mix stratum, which was quite a headache to address.
“地下立交桥段只有77米，但由于地质条件复杂，特别是粉砂混合地层，上海五家技术机构多次参与施工模拟，这是一个令人头疼的问题。
Sichuan project first in region that extracts clean energy from volcanic stratumA new well that pumps natural gas from volcanic stratum has been successfully dug in China's southwestern Sichuan province, becoming the first of its type in the region, according to PetroChina.
The well looks to extract gas trapped in the volcanic stratum, a rock formed by hardened magma.
More than 330 basins in over 20 countries and regions have reported oil or natural gas reserves in volcanic stratum, according to Sinopec News.
"The successful gas drilling in the Sichuan basin's volcanic stratum proves geologists' judgment that abundant gas is contained in the Sichuan basin's thick volcanic stratum," said Han Xiaoping, chief analyst with China Energy Net Consulting.
"The huge reservoir of natural gas in the volcanic stratum is also significant to secure China's national gas supply and will help build a lower-carbon energy future, according to Han.
If natural gas can form during the creation of volcanic stratum, it may also exist in deeper layers of the earth crust, which indicates a much greater space to explore and utilize natural gas, he added.
China has discovered a number of natural gas and oil reserves from volcanic stratum in the deep layers of basins across the country since 2002.
PetroChina Southwest Oil and Gasfield Co said it applied new technologies to dig the first well in the volcanic stratum area, increasing the drilling speed and reducing blockage of the gas storage layer.
However, temperatures at the seabed stratum can reach 249 C, while the pressure there is equivalent to putting 125,000 tons on a surface of one square meter, both of which present unique challenges to oil and service companies.
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