| 释义 |
stratum
UK ['strɑ:.təm] US ['stræ.əm] (plural strata)
noun countable
■one of the parts or layers into which something is separated 部分；层；阶层•The report shows that drugs have penetrated every stratum of American society.报告显示，毒品已经渗入美国社会的各个阶层。 ■specialized
■a layer of rock, soil or similar material 层；岩层；地层•The cliffs are characterized by remarkable zigzagging strata of shale, limestone and sandstone.悬崖的特征是，它们由一层层清晰易辨的页岩、石灰岩和砂岩交错构成。 |