stratum

英 [ˈstrɑːtəm]

美 [ˈstreɪtəm]

n. 层; 岩层; 地层; 阶层

复数：strata　

Collins.1 / BNC.8071 / COCA.11902

牛津词典

noun

N-COUNT 社会阶层
Astratumof society is a group of people in it who are similar in their education, income, or social status.
1. It was an enormous task that affected every stratum of society...
  这是一项影响到社会各阶层的重大工作。
2. The rebels came overwhelmingly from the poorest strata of rural society.
  叛乱分子绝大多数来自农村的最贫困阶层。
N-COUNT 岩层
Strataare different layers of rock.
1. Contained within the rock strata is evidence that the region was intensely dry 15,000 years ago.
  岩层中有证据表明，该地区在 15,000 年前曾经非常干旱。

noun

an abstract place usually conceived as having depth
1. a good actor communicates on several levels
2. a simile has at least two layers of meaning
3. the mind functions on many strata simultaneously
Synonym:levellayer
people having the same social, economic, or educational status
1. the working class
2. an emerging professional class
Synonym:classsocial classsocio-economic class
one of several parallel layers of material arranged one on top of another (such as a layer of tissue or cells in an organism or a layer of sedimentary rock)

An aquifer is a water-bearing rock stratum such as sandstone and chalk.
地下蓄水层是一些有水的岩石层，如沙岩和白垩岩。
It was an enormous task that affected every stratum of society
这是一项影响到社会各阶层的重大工作。
Layer bound characteristic of the mineral ore controlled by stratum and lithology being obvious.
矿体受地层和岩性控制，具有明显的层控特点。
Theory of key stratum in ground control.
岩层控制的关键层理论。
Effect of elastic modulus of stratum and cement sheath on casing strength
地层和水泥环弹性模量对套管强度的影响分析
The permeability barrier is located in the outermost layer of the epidermis, the stratum corneum.
这层通透性屏障位于表皮的最外层-角质层。
They represent each society stratum.
他们代表各个社会阶层。
Tramps are from the lowest stratum of society.
流浪汉来自社会最下层。
The rebels came overwhelmingly from the poorest strata of rural society.
叛乱分子绝大多数来自农村的最贫困阶层。
And it also can remain in the stratum corneum, exacerbating irritation.
而且它还会遗留在角质层中，加剧对肤质的刺激。