| 释义 |
stratumstra·tum /ˈstreɪt̬əm ; ˈstræt̬əm / noun [countable] (plural stra·ta /ˈstreɪt̬ə ; ˈstræt̬ə /)- (
geography地理) a layer or set of layers of rock, soil, etc.层；岩层；地层◆a thick stratum of flint / gravel厚厚的一层燧石／石子◆geological / limestone strata地质／石灰岩层
- (formal) a class in a society社会阶层◆people from all social strata来自社会各阶层的人
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