stratum

• 名词，指层或层次，例如材料（如织物或沉积岩）的平行层、社会或经济阶层，或抽象的深度或存在层次。

A noun referring to a layer or level, such as a parallel layer of material (e.g., tissue or sedimentary rock), a social or economic class of people, or an abstract depth or level of existence.

不规则复数

1. Layer of materialB2formalscientific

   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.

   层

   • Geologists studied the rock stratum for fossils.
   • The skin consists of multiple strata of cells.
   • Each stratum of sediment tells a story of the past.

   同义词bedlaminalayerseamtier

2. Social classB2formal

   A group of people sharing the same social, economic, or educational status.

   社会阶层

   • The upper stratum of society often has more opportunities.
   • Education can help people move between social strata.
   • The study examined different strata of the population.

   同义词casteclassgradelevelranksocial class

3. Abstract levelC1formal

   An abstract place or level usually conceived as having depth, such as in thought or culture.

   层次

   • The novel explores a deeper stratum of human consciousness.
   • Philosophy delves into the stratum of existence beyond the physical.
   • The artist's work touches a stratum of emotion rarely expressed.

   同义词echelonlayerlevelplanetier