stratum 的意思

释义：

n. 地层（单数）；阶层

构词：

strat扩散,引申为'层次'+um→n.[地] 地层, [生]组织的层, 社会阶层

例句：

An aquifer is a water - bearing rock stratum such as sandstone and chalk.
地下蓄水层是一些有水的岩石层,如沙岩和白垩岩. 换一句

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. 换一句

Tramps are from the lowest stratum of society.
流浪汉来自社会最下层. 换一句