单词	understratum
释义	un·der·stra·tum (ŭndər-strā′təm, -străt′əm) n. pl. un·der·stra·ta (-strā′tə, -străt′ə) or un·der·stra·tums A substratum.
随便看	national income nationalism nationalist nationalistic nationalistically nationality nationalization nationalize nationalizer nationally national monument national park national seashore National Socialism nationhood nationless Nation of Islam nation-state nationwide native Native Alaskan Native American native-born Native Hawaiian natively

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