1. I 〔地層〕a stratum ((複-ta)); a layer
    • 層をなして
    • in layers
    • 石炭層
    • a coal seam [bed]
    • 化石の層
    • a layer of fossils
  1. II 〔階層〕a class
    • 知識層
    • the intellectual class/the intelligentsia/intellectuals
    • 高所得層
    • a high income bracket
    • 読者層
    • a class of readers/a readership
    • 彼のファンの層は厚い
    • His fans include a wide variety of people.
  1. 層別抽出法 a stratified sampling method