| 释义 |
stra·tumBrE /ˈstrɑːtəm/ NAmE /ˈstreɪtəm/ noun (plural strataBrE /ˈstrɑːtə/ NAmE /ˈstreɪtə/ ) (geology地质学) a layer or set of layers of rock , earth , etc .层；岩层；地层(formal ) a class in a society 阶层◆ people from all social strata 来自不同社会阶层的人Easily-confused plural/singular formsbacteria/bacterium,criteria/criterion,data/datum,media/medium,phenomena/phenomenon,strata/stratum |