['strɑ:tə, 'streitə]
strata
n. 层(地层,岩歧,阶层,薄片)

英英解释:

名词 stratum:

  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 or a layer of sedimentary rock)
  2. 同义词:stratum
  3. an abstract place usually conceived as having depth
  4. 同义词:level, layer, stratum