| 单词 | substratum | 
| 释义 | substratum  (sʌbstrɑːtəm  ,  US -streɪt-  ) Word forms:  substrata   countable noun A substratum of something is a layer that lies under the surface of another layer, or a feature that is less obvious than other features.  [formal]  ...its deep substratum of chalk. [+ of]     His re-creation of the city is credible, with a substratum of fact to bolster the fiction.   | 
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