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 research of seismites mostly focuses on the marine stratum before Paleozoic.
  目前国内外学者对震积岩的研究主要集中在古生代以前的海相地层。
• 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。
• 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。
• 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。
• 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。
• 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。
• 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 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。
• 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。
• 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。