stratum
noun /ˈstrɑːtəm/
/ˈstreɪtəm/
(plural strata
/ˈstrɑːtə/
/ˈstreɪtə/
)- (geology
地质学 层；岩层；地层 - a thick stratum of flint
一层厚厚的燧石 - limestone strata
石灰岩地层 - Excavated coins can often be dated from other objects in the same stratum.
出土的硬币通常可以从同一地层的其他物体上确定年代。
- a thick stratum of flint
- (formal) a class in a society
阶层 - people from all social strata
来自不同社会阶层的人
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- people from all social strata
词源late 16th cent. (in the sense ‘layer or coat of a substance’): modern Latin, from Latin, literally ‘something spread or laid down’, neuter past participle of sternere ‘strew’.