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

• 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 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。
• 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。
• 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。
• A thin layer or stratum, as of coal or rock.
  薄薄的一层或层面，如煤或岩石的。
• 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。
• 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
• 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 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。