| 释义 |
stratum/ˈstrɑ:təm ||; ˈstretəm/noun [c] (plural strata /-tə ||; -tə/) (technical术语) a layer or set of layers of rock, earth, etc in the ground 地层；岩层 stra·tum /`stretəm; ˈstrɑːtəm/n [c], plural strata /-tə; -tə/formal 【正式】 1. a layer of rock or soil 岩层 2. a social class in society 社会阶层 |