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)

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。
Tramps are from the lowest stratum of society.
流浪汉来自社会最下层。
A thin layer or stratum, as of coal or rock.
薄薄的一层或层面，如煤或岩石的。
It concludes the stratum situation and economic relationships in Britain in her century.
它的结论是地层情况和经济关系，在英国，在她的世纪。
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。
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。
This is a stratum we must win over.
这一阶层，我们是必须争取的。
They found a stratum of coal thick enough to be mined with profit.
他们发现了含有厚到可以开采并获利的煤矿的地层。
It means, the modern embryonic form of social stratum structure has formed.
可以说，现代化的社会阶层结构的雏形已经形成。
Theory of key stratum in ground control.
岩层控制的关键层理论。