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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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