stratum

名词

1. 1

   地层、岩层常用复数 strata

   The lower strata of rock contain fossils millions of years old.

   下层的岩层里有数百万年前的化石。

2. 2

   阶层、社会阶层

   The policy mainly benefits the wealthiest stratum of society.

   这项政策主要嘉惠社会最富裕的阶层。

3. 3

   层、层次

   Each stratum of cells was examined under the microscope.

   每一层细胞都在显微镜下接受检视。