| 释义 |
stra.tumH5strB:7tEm, $5strAt7Emn [C]pl strata H9strA:YtR, $9strCtYRA stratum is one of the clear divisions into which something is separated.层The report shows that drugs have penetrated every stratum of American society.这报告表明毒品已渗透到了美国社会的各个阶层。Motorists from the higher social classes are slightly more likely to be involved in crashes than those in the lower strata of society.来自社会较高阶层的驾车者被卷入车祸的可能性比那些来自较低阶层的人略微大些。(specialized) An aquifer is a water-bearing rock stratum (= layer) such as sandstone or chalk.地下蓄水层是一些有水的岩石层，如沙岩和白垩岩。
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