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

• 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
• An identical soil stratum may exhibit elasticity, elasto-plasticity or visco-elastoplasticity under different modes of groundwater changing.
  同一土层在不同的水位变化模式下可表现为弹性、弹塑性或粘弹塑性的变形特征；
• 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。
• 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。
• 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。
• This is a stratum we must win over.
  这一阶层，我们是必须争取的。
• 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 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。
• 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。