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)

Tramps are from the lowest stratum of society.
流浪汉来自社会最下层。
Theory of key stratum in ground control.
岩层控制的关键层理论。
They do not constitute a separate class or stratum.
知识分子和青年学生并不是一个阶级或阶层。
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。
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 research of seismites mostly focuses on the marine stratum before Paleozoic.
目前国内外学者对震积岩的研究主要集中在古生代以前的海相地层。
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。
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。
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。
Let us choose a particular social stratum.
让我们挑选某个特定的社会阶层。