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

• Strengthens the stratum corneum cells in the fat layer to effectively resist the stimulation from sunlight and air pollution.
  增加脂肪层之角质层细胞，加强抵抗阳光和日常污浊空气带来之刺激。
• Tramps are from the lowest stratum of society.
  流浪汉来自社会最下层。
• 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。
• Theory of key stratum in ground control.
  岩层控制的关键层理论。
• 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。
• 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。
• 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 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。
• 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。
• And it also can remain in the stratum corneum, exacerbating irritation.
  而且它还会遗留在角质层中，加剧对肤质的刺激。