stratum

['streitəm]

n.地层,阶层

例句与用法：

A sharp ridge with steeply sloping sides, produced by erosion of the broken edges of highly tilted strata.

豚脊丘，陡峻的山脊由于对高斜层破碎山背的侵蚀而形成的陡峭的山背

A problem that cuts across all strata of society

一个影响到一切社会阶层的问题。

词形变化：

形容词: stratal | 名词复数: strata |

n.[C]

1. 层; 地层; (生物的)组织层

We can follow the history of life through the strata.

我们可以通过这一层层的地层跟踪生命的历史。

2. 社会阶层

Tramps are in a low stratum of society.

流浪汉生活在社会的下层。