| 单词 | stratum |
| 释义 | stratum n. (pl. strata) 1. esp. Geol. a layer or set of successive layers of any deposited substance. 2. an atmospheric layer. 3. a layer of tissue etc. 4. a a social grade, class, etc. (the various strata of society). b Statistics each of the groups into which a population is divided in stratified sampling. Derivatives stratal adj. Etymology: L, = something spread or laid down, neut. past part. of sternere strew |
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