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stratum
英/stɹˈɑːtəm/
美/ˈstɹætəm/
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01n.
层, 地层, 阶层
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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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)