Stratum
来自我不喜欢考试-知识库
目录 |
[编辑] 解释
[编辑] GRE 红宝书
- n. ( 复: strata) 地层;社会阶层
[编辑] Webster Collegiate
noun (plural strata)
- Etymology: New Latin, from Latin, spread, bed, from neuter of stratus, past participle of sternere to spread out — more at strew
- Date: 1599
- 1. a bed or layer artificially made
- 2.
- a. a sheetlike mass of sedimentary rock or earth of one kind lying between beds of other kinds
- b. a region of the sea or atmosphere that is analogous to a stratum of the earth
- c. a layer of tissue <deep stratum of the skin>
- d. a layer in which archaeological material (as artifacts, skeletons, and dwelling remains) is found on excavation
- 3.
- a. a part of a historical or sociological series representing a period or a stage of development
- b. a socioeconomic level of society comprising persons of the same or similar status especially with regard to education or culture
- 4. one of a series of layers, levels, or gradations in an ordered system <strata of thought>
- 5. a statistical subpopulation
- Usage:
- The plural strata has occasionally been used as a singular since the 18th century and is sometimes given the plural stratas <there was a strata of Paris which mere criticism of books fails to get hold of — Ezra Pound><a Roman burial ground suggests stratas of corruption and decay — Connie Fletcher, Booklist>. Current evidence shows senses 2, 3b, and 4 so used, with 3b the most common. Singular strata is persistent but not frequent. Strata may someday establish itself as a singular like agenda, but that use is still not established.