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

• Both inhibition of cell mitosis, can effectively penetrate into the stratum corneum.
  同时具有抑制细胞有丝分裂的作用，能有效地渗透进皮肤角质层。
• 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。
• 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。
• A thin layer or stratum, as of coal or rock.
  薄薄的一层或层面，如煤或岩石的。
• Theory of key stratum in ground control.
  岩层控制的关键层理论。
• 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 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。
• 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；
• 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。
• This is a stratum we must win over.
  这一阶层，我们是必须争取的。