Stratum [層]
層
1枚がもう1枚の上部に配置された物質の(例えば生物の組織、細胞の層または堆積岩の層)いくつかの平行な層の1枚
Stratum
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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