stratum相关的词根或词缀是: strat

Black-collar stratum really has become a target .

黑领阶层已经引起公愤。

His bankruptcy indicated the collective falling of the traditional commercial stratum .

他的破产，宣告了传统商人阶层的集体殒落。

Evans says the stratum corneum is made up of helical fibers of keratin that are woven together in a three-dimensional pattern .

伊埃文斯说，角质层由角蛋白螺旋状纤维维以三维结构紧密交织构成。

To qualify this social stratum , chinese researchers speak of " little prosperity . "

中国研究者用“有点资本”来定义这个社会阶层。

Until there is a highly educated stratum in a nation 's population , there will not be an adequate pool from which to draw teachers of technical subjects .

如果一个国家没有高学历阶层，那么就不能从中产生技术教师。