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  1. stratum

    • IPA[ˈstrɑːtəm]

    美式

    英式

    • n.
      地層;階層
    • 名詞複數:strata

    • 同反義

    同義詞

    1. a layer or a series of layers of rock in the ground

    2. a level or class to which people are assigned according to their social status, education, or income