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stratum (strata) layer的英文翻译是什么意思，词典释义与在线翻译：
英英释义
名词 stratum:
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one of several parallel layers of material arranged one on top of another (such as a layer of tissue or cells in an organism or a layer of sedimentary rock)
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people having the same social, economic, or educational status
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an abstract place usually conceived as having depth
