单词 | stratum |
释义 | stratumstratum /ˈstræt̮əm, ˈstreɪ-/ noun (plural strata /ˈstræt̮ə, ˈstreɪt̮ə/) [countable] 1earth science a layer of rock of a particular kind, especially one with different layers above and below it2a social class in a society3a layer of earth, such as one where tools, bones, etc. from an ancient civilization are found by digging |
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