stratum

柯林斯詞典

1. N-COUNT A stratum of society is a group of people in it who are similar in their education, income, or social status. 社會(huì)階層[正式] [usu with supp]
It was an enormous task that affected every stratum of society. 這是一項(xiàng)影響到社會(huì)各階層的重大任務(wù)。
2. N-COUNT Strata are different layers of rock. 巖層[技術(shù)] [usu pl]
Contained within the rock strata is evidence that the region was intensely dry 15,000 years ago. 巖層中的證據(jù)表明該地區(qū)在15,000 年前曾經(jīng)非常干旱。