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TOEFL BNC: 8071 COCA: 11902
stratumnoun [ C ]uk/ˈstrɑː.təm/ us/ˈstræt̬.əm/ plural strata uk/ˈstrɑː.tə/ us/ˈstræ.t̬ə/

one of the parts or layers into which something is separated部分;层;阶层

The report shows that drugs have penetrated every stratum of American society.报告显示,毒品已经渗入美国社会的各个阶层。

specialized geology a layer of rock, soil, or similar material层;岩层;地层

The cliffs are characterized by remarkable zigzagging strata of shale and sandstone.这些悬崖的特征是它们由一层层清晰易辨的页岩、石灰岩和砂岩交错构成。

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