| 单词 | stratum |
| 释义 | stratum (strɑːtəm , US streɪtəm ) Word forms: strata 1. countable noun A stratum of society is a group of people in it who are similar in their education, income, or social status. [formal] It was an enormous task that affected every stratum of society. [+ of] The rebels came overwhelmingly from the poorest strata of rural society. Synonyms: class, group, level, station 2. countable noun [usually plural] Strata are different layers of rock. [technical] Shale gas is methane trapped in rock strata. Collocations: rock strata It takes its name from tiny particles of a polymer that can be injected with water into oil-bearing rock strata. Times, Sunday Times These would force it down boreholes into rock strata lying up to three miles beneath the seabed. Times, Sunday Times Supporters of fracking argue that it can access vast supplies of natural gas lying locked in underground rock strata. Times, Sunday Times The rock strata are almost vertical, and the bands of rock are quite narrow. Retrieved from Wikipedia CC BY-SA 3.0 Rain water and pooled water from ponds, lakes and rivers percolate through the soil horizons and the upper rock strata, thus becoming groundwater. Retrieved from Wikipedia CC BY-SA 3.0 Translations: Chinese: 社会阶层 Japanese: 階層 |
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