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)

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。
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。
Tramps are from the lowest stratum of society.
流浪汉来自社会最下层。
The second migration power include buoyancy and tectonic activity, which controlled by stratum dip and faulting.
二次运移的动力包括浮力和构造活动力，其主要影响因素是地层倾角和断裂活动强度。
The stratum corneum is composed of dead cells surrounded by lipid membranes which mediate the permeability barrier.
角质层主要由围绕脂膜分布的死细胞构成调节通透性的屏障。
They represent each society stratum.
他们代表各个社会阶层。
A thin layer or stratum, as of coal or rock.
薄薄的一层或层面，如煤或岩石的。
This evolution is stratum accumulation but not replacement.
这种演进是“层累”式的，而并非是“替换”式的。
This is a stratum we must win over.
这一阶层，我们是必须争取的。
The population is divided into strata and a random sample is taken from each stratum.
总体分成阶层后由各阶层抽选出来的随机样本。