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)
people having the same social, economic, or educational status;
"the working class"
"an emerging professional class"
an abstract place usually conceived as having depth;
"a good actor communicates on several levels"
"a simile has at least two layers of meaning"
"the mind functions on many strata simultaneously"
stratum的用法和样例：
例句
用作名词 (n.)
They represent each society stratum. 他们代表各个社会阶层。
Such inequalities are found in every stratum. 这类不公平的现象存在于社会的每一个阶层。
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