stra·tum /ˈstretəm, ˈstræ-/
 地層,階層


 stra·tum /ˈstretəm, ˈstræt-/ 名詞
 (複strata)層,層聚(生態)


 stratum
 層


 stratum
 層


 Stra·tum n.; pl. E. Stratums L. Strata The latter is more common.
 1. Geol. A bed of earth or rock of one kind, formed by natural causes, and consisting usually of a series of layers, which form a rock as it lies between beds of other kinds. Also used figuratively.
 2. A bed or layer artificially made; a course.

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 stratum
      n 1: one of several parallel layers of material arranged one on
           top of another (such as a layer of tissue or cells in an
           organism)
      2: an abstract place usually conceived as having depth; "a good
         actor communicates on several levels"; "a simile has at
         least two layers of meaning"; "the mind functions on many
         strata simultaneously" [syn: level, layer]
      [also: strata (pl)]