stratum

英 [ˈstrɑːtəm]

美 [ˈstreɪtəm]

n.  层; 岩层; 地层; 阶层

复数：strata　

TOEFLGRETEM8医学

Collins.1 / BNC.8071 / COCA.11902

牛津词典

noun

• 层；岩层；地层
  a layer or set of layers of rock, earth, etc.
• 阶层
  a class in a society
  1. people from all social strata
     来自不同社会阶层的人

柯林斯词典

• 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。

英英释义

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)

双语例句

• 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。
• 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。
• A thin layer or stratum, as of coal or rock.
  薄薄的一层或层面，如煤或岩石的。
• A layer of rock with a particular composition ( especially of fossils); for dating the stratum.
  具有特殊成分，尤其是化石的一层岩石；可用来确定地层的年代。
• The chapter analysed two important concepts of the study of social stratification, class and stratum.
  此章主要分析了社会分层研究中的两个重要概念&阶级和阶层。
• In digging the well, the men struck first a stratum of sand, then several strata of rock.
  在挖井时，他们先挖掘到一层砂，之后是几层石头。
• 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。
• 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。
• 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。
• The stratum of main source rock among the marine facies is the upper Sinian and the Paleozoic group.
  其中海相地层中的主力烃源岩层为上震旦统和上古生界石炭―二叠系。