strata [ˈstrɑ:tə]

以下由轻松背单词网站提供

n.地层（复数）；社会阶层

（the plural of snack stratum）one of the parts or layers into which something is separated

The older strata gradually disintegrate. 较老的岩层渐渐风化。
They represent all social strata. 他们代表各个社会阶层。