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geology 地质学 a layer or set of layers of rock, earth, etc. 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。
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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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Word Originlate 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’.