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)
stratum [ˈstrɑ:təm]
托福
中文翻译
1
n. (组织的)层;[地质] 地层;社会阶层
英语释义
1
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)