stratum是什么意思_stratum怎么读_音标ˈstrɑ:təm

stratum是什么意思音标:英 [ˈstrɑ:təm]美 [ˈstreɪtəm]

n. 层, 地层, 阶层
[医] 层

n. 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)