| 单词 | substratum |
| 释义 | substratum n. (pl. substrata) 1. an underlying layer or substance. 2. a layer of rock or soil beneath the surface. 3. a foundation or basis (there is a substratum of truth in it). Etymology: mod.L, past part. of L substernere (as SUB-, sternere strew): cf. STRATUM |
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