stratum

n. 地层,阶层

A problem that cuts across all strata of society

一个影响到一切社会阶层的问题。

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